cleaning

.gitignore

@@ -4,3 +4,4 @@ run/
 run-data/
 .idea/
 .gradle/
+.c*

gradle.properties

@@ -38,7 +38,7 @@ mod_name=TravelersSuitcase
 # The license of the mod. Review your options at https://choosealicense.com/. All Rights Reserved is the default.
 mod_license=MIT
 # The mod version. See https://semver.org/
-mod_version=1.0-SNAPSHOT
+mod_version=1.2.7-SNAPSHOTv2
 # The group ID for the mod. It is only important when publishing as an artifact to a Maven repository.
 # This should match the base package used for the mod sources.
 # See https://maven.apache.org/guides/mini/guide-naming-conventions.html

src/main/java/io/lampnet/travelerssuitcase/Config.java

@@ -1,7 +1,8 @@
 package io.lampnet.travelerssuitcase;
 
 import net.minecraft.resources.ResourceLocation;
-import net.minecraft.world.item.Item;
+
+import net.minecraft.world.entity.EntityType;
 import net.minecraftforge.common.ForgeConfigSpec;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.common.Mod;
@@ -10,20 +11,210 @@ import net.minecraftforge.registries.ForgeRegistries;
 
 import java.util.List;
 import java.util.Set;
+import java.util.HashSet;
 import java.util.stream.Collectors;
 
 @Mod.EventBusSubscriber(modid = TravelersSuitcase.MODID, bus = Mod.EventBusSubscriber.Bus.MOD)
 public class Config {
     private static final ForgeConfigSpec.Builder BUILDER = new ForgeConfigSpec.Builder();
 
-    static final ForgeConfigSpec SPEC = BUILDER.build();
+    public static final ForgeConfigSpec.BooleanValue CAN_CAPTURE_HOSTILE;
+    public static final ForgeConfigSpec.ConfigValue<List<? extends String>> ENTITY_BLACKLIST;
 
-    private static boolean validateItemName(final Object obj) {
-        return obj instanceof final String itemName && ForgeRegistries.ITEMS.containsKey(new ResourceLocation(itemName));
+    public static final ForgeConfigSpec.LongValue DEFAULT_TIME_OF_DAY;
+
+    public static final ForgeConfigSpec.BooleanValue SHOULD_TICK_TIME;
+    public static final ForgeConfigSpec.BooleanValue TICK_WHEN_EMPTY;
+    
+    public static final ForgeConfigSpec.IntValue DEFAULT_SUNNY_TIME;
+    public static final ForgeConfigSpec.BooleanValue DEFAULT_RAINING;
+    public static final ForgeConfigSpec.IntValue DEFAULT_RAIN_TIME;
+    public static final ForgeConfigSpec.BooleanValue DEFAULT_THUNDERING;
+    public static final ForgeConfigSpec.IntValue DEFAULT_THUNDER_TIME;
+
+    public static final ForgeConfigSpec.IntValue DIMENSION_HEIGHT;
+    public static final ForgeConfigSpec.IntValue DIMENSION_MIN_Y;
+    public static final ForgeConfigSpec.DoubleValue COORDINATE_SCALE;
+    public static final ForgeConfigSpec.DoubleValue AMBIENT_LIGHT;
+
+    static final ForgeConfigSpec SPEC;
+
+    static {
+        BUILDER.comment("Entity Configuration").push("entities");
+
+        CAN_CAPTURE_HOSTILE = BUILDER
+                .comment("Whether hostile entities can be captured in suitcases")
+                .define("canCaptureHostile", false);
+
+        ENTITY_BLACKLIST = BUILDER
+                .comment("List of entity types that cannot be captured (e.g., minecraft:ender_dragon)")
+                .defineListAllowEmpty("blacklistedEntities", 
+                    List.of("minecraft:ender_dragon", "minecraft:wither"),
+                    Config::validateEntityName);
+
+        BUILDER.pop();
+
+        BUILDER.comment("Pocket Dimension Configuration").push("pocket_dimensions");
+
+        DEFAULT_TIME_OF_DAY = BUILDER
+                .comment("Default time of day in pocket dimensions (0-24000, where 6000 is noon)")
+                .defineInRange("defaultTimeOfDay", 6000L, 0L, 24000L);
+
+
+
+        SHOULD_TICK_TIME = BUILDER
+                .comment("Whether time should advance in pocket dimensions")
+                .define("shouldTickTime", true);
+
+        TICK_WHEN_EMPTY = BUILDER
+                .comment("Whether pocket dimensions should tick when no players are present")
+                .define("tickWhenEmpty", true);
+
+        BUILDER.pop();
+
+        BUILDER.comment("Weather Configuration").push("weather");
+
+        DEFAULT_SUNNY_TIME = BUILDER
+                .comment("Default duration of sunny weather in pocket dimensions (ticks)")
+                .defineInRange("defaultSunnyTime", Integer.MAX_VALUE, 0, Integer.MAX_VALUE);
+
+        DEFAULT_RAINING = BUILDER
+                .comment("Whether pocket dimensions should start with rain")
+                .define("defaultRaining", false);
+
+        DEFAULT_RAIN_TIME = BUILDER
+                .comment("Default rain duration in pocket dimensions (ticks)")
+                .defineInRange("defaultRainTime", 0, 0, Integer.MAX_VALUE);
+
+        DEFAULT_THUNDERING = BUILDER
+                .comment("Whether pocket dimensions should start with thunder")
+                .define("defaultThundering", false);
+
+        DEFAULT_THUNDER_TIME = BUILDER
+                .comment("Default thunder duration in pocket dimensions (ticks)")
+                .defineInRange("defaultThunderTime", 0, 0, Integer.MAX_VALUE);
+
+        BUILDER.pop();
+
+        BUILDER.comment("Dimension Properties").push("dimension_properties");
+
+        DIMENSION_HEIGHT = BUILDER
+                .comment("Height of pocket dimensions (must be multiple of 16)")
+                .defineInRange("dimensionHeight", 384, 64, 4064);
+
+        DIMENSION_MIN_Y = BUILDER
+                .comment("Minimum Y level for pocket dimensions")
+                .defineInRange("dimensionMinY", -64, -2032, 2016);
+
+        COORDINATE_SCALE = BUILDER
+                .comment("Coordinate scale for pocket dimensions")
+                .defineInRange("coordinateScale", 1.0, 0.00001, 30000000.0);
+
+        AMBIENT_LIGHT = BUILDER
+                .comment("Ambient light level in pocket dimensions (0.0 - 1.0)")
+                .defineInRange("ambientLight", 0.0, 0.0, 1.0);
+
+        BUILDER.pop();
+
+        SPEC = BUILDER.build();
     }
 
+    private static boolean validateEntityName(final Object obj) {
+        if (!(obj instanceof String entityName)) {
+            return false;
+        }
+        try {
+            ResourceLocation location = ResourceLocation.parse(entityName);
+            return ForgeRegistries.ENTITY_TYPES.containsKey(location);
+        } catch (Exception e) {
+            return false;
+        }
+    }
+
+    private static Set<EntityType<?>> cachedEntityBlacklist = new HashSet<>();
+
     @SubscribeEvent
     static void onLoad(final ModConfigEvent event) {
+        if (event.getConfig().getSpec() == SPEC) {
+            updateCachedValues();
+            TravelersSuitcase.LOGGER.info("Configuration loaded");
+        }
+    }
 
+    private static void updateCachedValues() {
+        cachedEntityBlacklist = ENTITY_BLACKLIST.get().stream()
+                .map(entityName -> {
+                    try {
+                        ResourceLocation location = ResourceLocation.parse(entityName);
+                        return ForgeRegistries.ENTITY_TYPES.getValue(location);
+                    } catch (Exception e) {
+                        TravelersSuitcase.LOGGER.warn("Invalid entity name in blacklist: {}", entityName);
+                        return null;
+                    }
+                })
+                .filter(entityType -> entityType != null)
+                .collect(Collectors.toSet());
+    }
+
+    public static boolean canCaptureHostile() {
+        return CAN_CAPTURE_HOSTILE.get();
+    }
+
+    public static Set<EntityType<?>> getEntityBlacklist() {
+        return new HashSet<>(cachedEntityBlacklist);
+    }
+
+    public static boolean isEntityBlacklisted(EntityType<?> entityType) {
+        return cachedEntityBlacklist.contains(entityType);
+    }
+
+    public static long getDefaultTimeOfDay() {
+        return DEFAULT_TIME_OF_DAY.get();
+    }
+
+
+
+    public static boolean shouldTickTime() {
+        return SHOULD_TICK_TIME.get();
+    }
+
+    public static boolean tickWhenEmpty() {
+        return TICK_WHEN_EMPTY.get();
+    }
+
+    public static int getDefaultSunnyTime() {
+        return DEFAULT_SUNNY_TIME.get();
+    }
+
+    public static boolean isDefaultRaining() {
+        return DEFAULT_RAINING.get();
+    }
+
+    public static int getDefaultRainTime() {
+        return DEFAULT_RAIN_TIME.get();
+    }
+
+    public static boolean isDefaultThundering() {
+        return DEFAULT_THUNDERING.get();
+    }
+
+    public static int getDefaultThunderTime() {
+        return DEFAULT_THUNDER_TIME.get();
+    }
+
+    public static int getDimensionHeight() {
+        return DIMENSION_HEIGHT.get();
+    }
+
+    public static int getDimensionMinY() {
+        return DIMENSION_MIN_Y.get();
+    }
+
+    public static double getCoordinateScale() {
+        return COORDINATE_SCALE.get();
+    }
+
+    public static double getAmbientLight() {
+        return AMBIENT_LIGHT.get();
     }
 }

src/main/java/io/lampnet/travelerssuitcase/SuitcaseRegistryState.java

@@ -1,21 +1,21 @@
 package io.lampnet.travelerssuitcase;
 
 import io.lampnet.travelerssuitcase.block.entity.SuitcaseBlockEntity;
+import net.minecraft.core.BlockPos;
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.nbt.ListTag;
 import net.minecraft.nbt.Tag;
 import net.minecraft.server.MinecraftServer;
-import net.minecraft.world.level.saveddata.SavedData;
-import net.minecraft.core.BlockPos;
+import net.minecraft.server.level.ServerLevel;
 import net.minecraft.world.level.Level;
-import org.jetbrains.annotations.NotNull;
+import net.minecraft.world.level.saveddata.SavedData;
 
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
 
 public class SuitcaseRegistryState extends SavedData {
-    private static final String REGISTRY_KEY = "travelers_suitcase_registry";
+    public static final String DATA_NAME = "travelers_suitcase_registry";
     private final Map<String, Map<String, BlockPos>> registry = new HashMap<>();
 
     public SuitcaseRegistryState() {
@@ -23,62 +23,86 @@ public class SuitcaseRegistryState extends SavedData {
     }
 
     @Override
-    public @NotNull CompoundTag save(@NotNull CompoundTag nbt) {
-        ListTag keystonesList = new ListTag();
-        for (Map.Entry<String, Map<String, BlockPos>> keystoneEntry : registry.entrySet()) {
-            CompoundTag keystoneNbt = new CompoundTag();
-            keystoneNbt.putString("KeystoneName", keystoneEntry.getKey());
-            ListTag playersList = getPlayersList(keystoneEntry);
-            keystoneNbt.put("Players", playersList);
-            keystonesList.add(keystoneNbt);
+    public CompoundTag save(CompoundTag nbt) {
+        CompoundTag top = new CompoundTag();
+        for (Map.Entry<String, Map<String, BlockPos>> entry : registry.entrySet()) {
+            String keystone = entry.getKey();
+            Map<String, BlockPos> playerMap = entry.getValue();
+
+            ListTag playerList = new ListTag();
+            for (Map.Entry<String, BlockPos> e2 : playerMap.entrySet()) {
+                CompoundTag record = new CompoundTag();
+                record.putString("UUID", e2.getKey());
+                BlockPos pos = e2.getValue();
+                record.putInt("X", pos.getX());
+                record.putInt("Y", pos.getY());
+                record.putInt("Z", pos.getZ());
+                playerList.add(record);
             }
-        nbt.put("SuitcaseRegistry", keystonesList);
+            top.put(keystone, playerList);
+        }
+        nbt.put("RegistryEntries", top);
         return nbt;
     }
 
-    private static @NotNull ListTag getPlayersList(Map.Entry<String, Map<String, BlockPos>> keystoneEntry) {
-        ListTag playersList = new ListTag();
-        for (Map.Entry<String, BlockPos> playerEntry : keystoneEntry.getValue().entrySet()) {
-            CompoundTag playerNbt = new CompoundTag();
-            playerNbt.putString("UUID", playerEntry.getKey());
-            BlockPos pos = playerEntry.getValue();
-            playerNbt.putInt("X", pos.getX());
-            playerNbt.putInt("Y", pos.getY());
-            playerNbt.putInt("Z", pos.getZ());
-
-            playersList.add(playerNbt);
-        }
-        return playersList;
-    }
-
     public static SuitcaseRegistryState load(CompoundTag nbt) {
-        SuitcaseRegistryState state = new SuitcaseRegistryState();
-        if (nbt.contains("SuitcaseRegistry")) {
-            ListTag keystonesList = nbt.getList("SuitcaseRegistry", Tag.TAG_COMPOUND);
-            for (int i = 0; i < keystonesList.size(); i++) {
-                CompoundTag keystoneNbt = keystonesList.getCompound(i);
-                String keystoneName = keystoneNbt.getString("KeystoneName");
-                Map<String, BlockPos> playersMap = new HashMap<>();
-                ListTag playersList = keystoneNbt.getList("Players", Tag.TAG_COMPOUND);
-                for (int j = 0; j < playersList.size(); j++) {
-                    CompoundTag playerNbt = playersList.getCompound(j);
-                    String uuid = playerNbt.getString("UUID");
-                    BlockPos pos = new BlockPos(
-                            playerNbt.getInt("X"),
-                            playerNbt.getInt("Y"),
-                            playerNbt.getInt("Z")
+        SuitcaseRegistryState data = new SuitcaseRegistryState();
+        if (nbt.contains("RegistryEntries", Tag.TAG_COMPOUND)) {
+            CompoundTag top = nbt.getCompound("RegistryEntries");
+            for (String keystone : top.getAllKeys()) {
+                ListTag playerList = top.getList(keystone, Tag.TAG_COMPOUND);
+                Map<String, BlockPos> playerMap = new HashMap<>();
+                for (int i = 0; i < playerList.size(); i++) {
+                    CompoundTag rec = playerList.getCompound(i);
+                    String uuid = rec.getString("UUID");
+                    int x = rec.getInt("X");
+                    int y = rec.getInt("Y");
+                    int z = rec.getInt("Z");
+                    playerMap.put(uuid, new BlockPos(x, y, z));
+                }
+                data.registry.put(keystone, playerMap);
+            }
+        }
+        return data;
+    }
+
+    public void syncFromStaticRegistry() {
+        registry.clear();
+        SuitcaseBlockEntity.saveSuitcaseRegistryTo(registry);
+        setDirty();
+    }
+
+    public void syncToStaticRegistry() {
+        SuitcaseBlockEntity.initializeSuitcaseRegistry(registry);
+    }
+
+    public static void onServerStart(MinecraftServer server) {
+        Level overworld = server.getLevel(Level.OVERWORLD);
+        if (overworld == null) return;
+
+        SuitcaseRegistryState data = Objects.requireNonNull(((ServerLevel) overworld).getDataStorage()).computeIfAbsent(
+                SuitcaseRegistryState::load,
+                SuitcaseRegistryState::new,
+                DATA_NAME
         );
-                    playersMap.put(uuid, pos);
+        data.syncToStaticRegistry();
     }
-                state.registry.put(keystoneName, playersMap);
-            }
-        }
-        return state;
+
+    public static void onRegistryChanged(MinecraftServer server) {
+        Level overworld = server.getLevel(Level.OVERWORLD);
+        if (overworld == null) return;
+
+        SuitcaseRegistryState data = Objects.requireNonNull(((ServerLevel) overworld).getDataStorage()).computeIfAbsent(
+                SuitcaseRegistryState::load,
+                SuitcaseRegistryState::new,
+                DATA_NAME
+        );
+        data.syncFromStaticRegistry();
     }
 
     public static SuitcaseRegistryState getState(MinecraftServer server) {
-        return Objects.requireNonNull(server.getLevel(Level.OVERWORLD)).getDataStorage()
-                .computeIfAbsent(SuitcaseRegistryState::load, SuitcaseRegistryState::new, REGISTRY_KEY);
+        return Objects.requireNonNull(((ServerLevel) server.getLevel(Level.OVERWORLD)).getDataStorage())
+                .computeIfAbsent(SuitcaseRegistryState::load, SuitcaseRegistryState::new, DATA_NAME);
     }
 
     public Map<String, Map<String, BlockPos>> getRegistry() {

src/main/java/io/lampnet/travelerssuitcase/TravelersSuitcase.java

@@ -1,22 +1,85 @@
 package io.lampnet.travelerssuitcase;
 
+
+import com.mojang.brigadier.arguments.StringArgumentType;
+import com.mojang.brigadier.builder.LiteralArgumentBuilder;
 import io.lampnet.travelerssuitcase.block.ModBlocks;
+import io.lampnet.travelerssuitcase.block.SuitcaseBlock;
 import io.lampnet.travelerssuitcase.block.entity.ModBlockEntities;
+import io.lampnet.travelerssuitcase.block.entity.SuitcaseBlockEntity;
+import io.lampnet.travelerssuitcase.criterion.EnterPocketDimensionCriterion;
+import io.lampnet.travelerssuitcase.data.MobEntryData;
+import io.lampnet.travelerssuitcase.data.PlayerEntryData;
+import io.lampnet.travelerssuitcase.item.KeystoneItem;
 import io.lampnet.travelerssuitcase.item.ModItemGroups;
 import io.lampnet.travelerssuitcase.item.ModItems;
-import io.lampnet.travelerssuitcase.block.entity.SuitcaseBlockEntity;
-import io.lampnet.travelerssuitcase.SuitcaseRegistryState;
+import io.lampnet.travelerssuitcase.world.Fantasy;
+import io.lampnet.travelerssuitcase.world.FantasyInitializer;
+import io.lampnet.travelerssuitcase.world.PortalChunkGenerator;
+import io.lampnet.travelerssuitcase.world.RuntimeWorldConfig;
+import net.minecraft.advancements.CriteriaTriggers;
+import net.minecraft.commands.CommandSourceStack;
+import net.minecraft.commands.Commands;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.registries.BuiltInRegistries;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.network.chat.Component;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.sounds.SoundEvents;
+import net.minecraft.sounds.SoundSource;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.InteractionResult;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.entity.monster.Enemy;
+import net.minecraft.world.entity.animal.Wolf;
+import net.minecraft.world.item.BlockItem;
+import net.minecraft.world.item.Items;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.phys.Vec3;
 import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.event.RegisterCommandsEvent;
+import net.minecraftforge.event.entity.player.PlayerInteractEvent;
+import net.minecraftforge.event.server.ServerStartingEvent;
 import net.minecraftforge.eventbus.api.IEventBus;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.event.lifecycle.FMLCommonSetupEvent;
 import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
+import net.minecraftforge.fml.ModLoadingContext;
+import net.minecraftforge.fml.config.ModConfig;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import java.util.Set;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.world.entity.Entity;
+
+
+import io.lampnet.travelerssuitcase.world.RuntimeWorldHandle;
 
 @Mod(TravelersSuitcase.MODID)
 public class TravelersSuitcase {
     public static final String MODID = "travelerssuitcase";
     public static final Logger LOGGER = LogManager.getLogger(MODID);
+    public static final EnterPocketDimensionCriterion ENTER_POCKET_DIMENSION = CriteriaTriggers.register(new EnterPocketDimensionCriterion());
+
+    public static boolean getCanCaptureHostile() {
+        return Config.canCaptureHostile();
+    }
+
+    public static Set<EntityType<?>> getEntityBlacklist() {
+        return Config.getEntityBlacklist();
+    }
+
+    public static boolean isBlacklisted(EntityType<?> entityType) {
+        return Config.isEntityBlacklisted(entityType);
+    }
 
     public TravelersSuitcase() {
         IEventBus modEventBus = FMLJavaModLoadingContext.get().getModEventBus();
@@ -25,56 +88,450 @@ public class TravelersSuitcase {
         ModBlocks.register(modEventBus);
         ModItemGroups.register(modEventBus);
         ModBlockEntities.register(modEventBus);
+        FantasyInitializer.register(modEventBus);
 
-        MinecraftForge.EVENT_BUS.addListener(this::onWorldLoad);
-        MinecraftForge.EVENT_BUS.addListener(this::onServerStarting);
-        MinecraftForge.EVENT_BUS.addListener(this::onServerStopping);
+        // Register configuration
+        ModLoadingContext.get().registerConfig(ModConfig.Type.COMMON, Config.SPEC);
 
-        LOGGER.info("Initializing " + MODID);
+        modEventBus.addListener(this::commonSetup);
+
+        MinecraftForge.EVENT_BUS.register(this);
+        MinecraftForge.EVENT_BUS.register(TravelersSuitcase.class);
     }
 
-    private void onWorldLoad(net.minecraftforge.event.level.LevelEvent.Load event) {
-        if (event.getLevel() instanceof net.minecraft.server.level.ServerLevel world) {
-            if (world.dimension().location().getNamespace().equals(MODID)) {
-                String dimensionName = world.dimension().location().getPath();
-                java.nio.file.Path structureMarkerPath = world.getServer().getWorldPath(net.minecraft.world.level.storage.LevelResource.ROOT)
+    private void commonSetup(final FMLCommonSetupEvent event) {
+        new FantasyInitializer().onInitialize();
+    }
+
+    @SubscribeEvent
+    public static void onServerStarting(ServerStartingEvent event) {
+        SuitcaseRegistryState.onServerStart(event.getServer());
+
+        Path registryFile = event.getServer().getWorldPath(net.minecraft.world.level.storage.LevelResource.ROOT)
                 .resolve("data")
                 .resolve(MODID)
-                        .resolve("pending_structures")
-                        .resolve(dimensionName + ".txt");
-                if (java.nio.file.Files.exists(structureMarkerPath)) {
+                .resolve("dimension_registry")
+                .resolve("registry.txt");
+
+        if (!Files.exists(registryFile)) {
+            return;
+        }
+        var biomeRegistry = event.getServer().registryAccess().registryOrThrow(Registries.BIOME);
+
+        long seed = event.getServer().overworld().getSeed();
         try {
-                        net.minecraft.world.level.levelgen.structure.templatesystem.StructureTemplate template = world.getServer().getStructureManager()
-                                .get(new net.minecraft.resources.ResourceLocation(MODID, "pocket_island_01"))
-                                .orElse(null);
-                        if (template != null) {
-                            net.minecraft.core.BlockPos pos = new net.minecraft.core.BlockPos(0, 64, 0);
-                            template.placeInWorld(
-                                    world,
-                                    pos,
-                                    pos,
-                                    new net.minecraft.world.level.levelgen.structure.templatesystem.StructurePlaceSettings(),
-                                    world.getRandom(),
-                                    net.minecraft.world.level.block.Block.UPDATE_ALL
+            for (String dimName : Files.readAllLines(registryFile)) {
+                ResourceLocation worldId = ResourceLocation.fromNamespaceAndPath(MODID, dimName);
+
+                var voidGen = new PortalChunkGenerator(biomeRegistry);
+
+                var cfg = new RuntimeWorldConfig()
+                        .setGenerator(voidGen)
+                        .setSeed(seed);
+                RuntimeWorldHandle handle = Fantasy.get(event.getServer()).getOrOpenPersistentWorld(worldId, cfg);
+                
+                handle.setTickWhenEmpty(Config.tickWhenEmpty());
+            }
+        } catch (IOException e) {
+            TravelersSuitcase.LOGGER.error("Failed to reload pocket dimensions", e);
+        }
+    }
+
+    @SubscribeEvent
+    public static void onRegisterCommands(RegisterCommandsEvent event) {
+        LiteralArgumentBuilder<CommandSourceStack> builder = Commands.literal("travelerssuitcase")
+                .then(Commands.literal("setMobEntry")
+                        .executes(ctx -> {
+                            var src = ctx.getSource();
+                            var world = src.getLevel();
+                            var id = world.dimension().location();
+                            if (!id.getNamespace().equals(MODID)
+                                    || !id.getPath().startsWith("pocket_dimension_")) {
+                                src.sendFailure(Component.literal("§cNot in a pocket dimension"));
+                                return 0;
+                            }
+                            var pos = src.getPosition();
+                            var yaw = src.getEntity().getYRot();
+                            var pitch = src.getEntity().getXRot();
+
+                            MobEntryData.get(world).setEntry(pos, yaw, pitch);
+                            src.sendSuccess(() -> Component.literal(
+                                    String.format("§aMob entry set to %.2f, %.2f, %.2f", pos.x(), pos.y(), pos.z())
+                            ), false);
+                            return 1;
+                        })
+                )
+                .then(Commands.literal("setPlayerEntry")
+                        .executes(ctx -> {
+                            var src = ctx.getSource();
+                            var world = src.getLevel();
+                            var id = world.dimension().location();
+                            if (!id.getNamespace().equals(MODID)
+                                    || !id.getPath().startsWith("pocket_dimension_")) {
+                                src.sendFailure(Component.literal("§cNot in a pocket dimension"));
+                                return 0;
+                            }
+                            var pos = src.getPosition();
+                            var yaw = src.getEntity().getYRot();
+                            var pitch = src.getEntity().getXRot();
+
+                            PlayerEntryData.get(world).setEntry(pos, yaw, pitch);
+                            src.sendSuccess(() -> Component.literal(
+                                    String.format("§aPlayer entry set to %.2f, %.2f, %.2f", pos.x(), pos.y(), pos.z())
+                            ), false);
+                            return 1;
+                        }))
+                .then(Commands.literal("getPlayerEntry")
+                        .executes(ctx -> {
+                            var src = ctx.getSource();
+                            var world = src.getLevel();
+                            var id = world.dimension().location();
+                            if (!id.getNamespace().equals(MODID)
+                                    || !id.getPath().startsWith("pocket_dimension_")) {
+                                src.sendFailure(Component.literal("§cNot in a pocket dimension"));
+                                return 0;
+                            }
+                            
+                            PlayerEntryData data = PlayerEntryData.get(world);
+                            Vec3 pos = data.getEntryPos();
+                            float yaw = data.getEntryYaw();
+                            float pitch = data.getEntryPitch();
+                            
+                            src.sendSuccess(() -> Component.literal(
+                                    String.format("§aPlayer entry: %.2f, %.2f, %.2f (yaw: %.1f, pitch: %.1f)", 
+                                            pos.x(), pos.y(), pos.z(), yaw, pitch)
+                            ), false);
+                            return 1;
+                        })
+                )
+                .then(Commands.literal("getMobEntry")
+                        .executes(ctx -> {
+                            var src = ctx.getSource();
+                            var world = src.getLevel();
+                            var id = world.dimension().location();
+                            if (!id.getNamespace().equals(MODID)
+                                    || !id.getPath().startsWith("pocket_dimension_")) {
+                                src.sendFailure(Component.literal("§cNot in a pocket dimension"));
+                                return 0;
+                            }
+                            
+                            MobEntryData data = MobEntryData.get(world);
+                            Vec3 pos = data.getEntryPos();
+                            float yaw = data.getEntryYaw();
+                            float pitch = data.getEntryPitch();
+                            
+                            src.sendSuccess(() -> Component.literal(
+                                    String.format("§aMob entry: %.2f, %.2f, %.2f (yaw: %.1f, pitch: %.1f)", 
+                                            pos.x(), pos.y(), pos.z(), yaw, pitch)
+                            ), false);
+                            return 1;
+                        })
+                )
+                .then(Commands.literal("resetPlayerEntry")
+                        .then(Commands.argument("dimension", StringArgumentType.word())
+                                .executes(ctx -> {
+                                    var src = ctx.getSource();
+                                    String dimSuffix = StringArgumentType.getString(ctx, "dimension");
+                                    
+                                    ResourceLocation dimId = ResourceLocation.fromNamespaceAndPath(MODID, "pocket_dimension_" + dimSuffix);
+                                    ResourceKey<Level> worldKey = ResourceKey.create(Registries.DIMENSION, dimId);
+                                    ServerLevel targetWorld = src.getServer().getLevel(worldKey);
+                                    
+                                    if (targetWorld == null) {
+                                        src.sendFailure(Component.literal("§cPocket dimension '" + dimSuffix + "' not found"));
+                                        return 0;
+                                    }
+                                    
+                                    PlayerEntryData playerData = PlayerEntryData.get(targetWorld);
+                                    playerData.resetToDefault();
+                                    
+                                    src.sendSuccess(() -> Component.literal(
+                                            "§aPlayer entry reset for pocket dimension '" + dimSuffix + "'"
+                                    ), false);
+                                    return 1;
+                                })
+                        )
+                )
+                .then(Commands.literal("resetMobEntry")
+                        .then(Commands.argument("dimension", StringArgumentType.word())
+                                .executes(ctx -> {
+                                    var src = ctx.getSource();
+                                    String dimSuffix = StringArgumentType.getString(ctx, "dimension");
+                                    
+                                    ResourceLocation dimId = ResourceLocation.fromNamespaceAndPath(MODID, "pocket_dimension_" + dimSuffix);
+                                    ResourceKey<Level> worldKey = ResourceKey.create(Registries.DIMENSION, dimId);
+                                    ServerLevel targetWorld = src.getServer().getLevel(worldKey);
+                                    
+                                    if (targetWorld == null) {
+                                        src.sendFailure(Component.literal("§cPocket dimension '" + dimSuffix + "' not found"));
+                                        return 0;
+                                    }
+                                    
+                                    MobEntryData mobData = MobEntryData.get(targetWorld);
+                                    mobData.setEntry(new Vec3(35.5, 85.0, 16.5), 0f, 0f);
+                                    
+                                    src.sendSuccess(() -> Component.literal(
+                                            "§aMob entry reset for pocket dimension '" + dimSuffix + "'"
+                                    ), false);
+                                    return 1;
+                                })
+                        )
+                )
+                .then(Commands.literal("listDimensions")
+                        .requires(src -> src.hasPermission(2))
+                        .executes(ctx -> {
+                            var src = ctx.getSource();
+                            src.sendSuccess(() -> Component.literal("§aPocket Dimensions Loaded:"), false);
+                            boolean foundAny = false;
+                            for (ServerLevel world : src.getServer().getAllLevels()) {
+                                var id = world.dimension().location();
+                                String namespace = id.getNamespace();
+                                String path = id.getPath();
+                                String prefix = "pocket_dimension_";
+                                
+                                if (MODID.equals(namespace) && path.startsWith(prefix)) {
+                                    String suffix = path.substring(prefix.length());
+                                    src.sendSuccess(() -> Component.literal(" " + suffix), false);
+                                    foundAny = true;
+                                }
+                            }
+                            if (!foundAny) {
+                                src.sendSuccess(() -> Component.literal("§cNo pocket dimensions found."), false);
+                            }
+                            return 1;
+                        })
+                )
+                .then(Commands.literal("canCaptureHostile")
+                        .requires(src -> src.hasPermission(2))
+                                                .executes(ctx -> {
+                            boolean enabled = Config.canCaptureHostile();
+                            ctx.getSource().sendSuccess(() -> Component.literal(
+                                    "§7Hostile mob capture is currently: " + (enabled ? "§aEnabled" : "§cDisabled") + 
+                                    "\n§7(Configure in config file)"
+                            ), false);
+                            return 1;
+                        })
+                )
+                .then(Commands.literal("mobBlacklist")
+                        .requires(src -> src.hasPermission(2))
+                        .then(Commands.literal("add")
+                                .then(Commands.argument("entity", StringArgumentType.string())
+                                        .executes(ctx -> {
+                                            var src = ctx.getSource();
+                                            String entityString = StringArgumentType.getString(ctx, "entity");
+                                            try {
+                                                ResourceLocation entityId = ResourceLocation.parse(entityString);
+                                                EntityType<?> entityType = BuiltInRegistries.ENTITY_TYPE.get(entityId);
+                                                if (entityType == EntityType.PIG && !entityString.equals("minecraft:pig")) {
+                                                    src.sendFailure(Component.literal("§cUnknown entity type: " + entityString));
+                                                    return 0;
+                                                }
+                                                if (entityType == EntityType.PLAYER) {
+                                                    src.sendFailure(Component.literal("§cCannot blacklist players"));
+                                                    return 0;
+                                                }
+                                                src.sendSuccess(() -> Component.literal("§aAdded " + entityId + " to blacklist"), false);
+                                                return 1;
+                                            } catch (Exception e) {
+                                                src.sendFailure(Component.literal("§cInvalid entity identifier: " + entityString));
+                                                return 0;
+                                            }
+                                        })
+                                )
+                        )
+                        .then(Commands.literal("remove")
+                                .then(Commands.argument("entity", StringArgumentType.string())
+                                        .executes(ctx -> {
+                                            var src = ctx.getSource();
+                                            String entityString = StringArgumentType.getString(ctx, "entity");
+                                            try {
+                                                var entityId = ResourceLocation.parse(entityString);
+                                                var entityType = BuiltInRegistries.ENTITY_TYPE.get(entityId);
+                                                if (entityType == EntityType.PIG && !entityString.equals("minecraft:pig")) {
+                                                    src.sendFailure(Component.literal("§cUnknown entity type: " + entityString));
+                                                    return 0;
+                                                }
+                                                src.sendSuccess(() -> Component.literal("§eEntity blacklist is managed through configuration files"), false);
+                                                return 1;
+                                            } catch (Exception e) {
+                                                src.sendFailure(Component.literal("§cInvalid entity identifier: " + entityString));
+                                                return 0;
+                                            }
+                                        })
+                                )
+                        )
+                        .then(Commands.literal("list")
+                                .executes(ctx -> {
+                                    var src = ctx.getSource();
+                                    Set<EntityType<?>> blacklist = Config.getEntityBlacklist();
+                                    if (blacklist.isEmpty()) {
+                                        src.sendSuccess(() -> Component.literal("§7No entities are blacklisted"), false);
+                                    } else {
+                                        src.sendSuccess(() -> Component.literal("§aBlacklisted entities:"), false);
+                                        blacklist.forEach(entityType -> {
+                                            var id = BuiltInRegistries.ENTITY_TYPE.getKey(entityType);
+                                            src.sendSuccess(() -> Component.literal(" " + id), false);
+                                        });
+                                    }
+                                    return 1;
+                                })
+                        )
+                        .then(Commands.literal("clear")
+.executes(ctx -> {
+                                    var src = ctx.getSource();
+                                    src.sendSuccess(() -> Component.literal("§eEntity blacklist is managed through configuration files"), false);
+                                    return 1;
+                                })
+                        )
                 );
-                            java.nio.file.Files.delete(structureMarkerPath);
+        event.getDispatcher().register(builder);
     }
-                    } catch (java.io.IOException e) {
-                        LOGGER.error("Failed to place structure", e);
+
+
+
+    @SubscribeEvent
+    public void onUseEntity(PlayerInteractEvent.EntityInteract event) {
+        Level world = event.getLevel();
+        if (world.isClientSide) return;
+        var player = event.getEntity();
+        var hand = event.getHand();
+        var entity = event.getTarget();
+        var stack = player.getItemInHand(hand);
+        
+        // Suitcase mob teleport
+        if (stack.getItem() instanceof BlockItem bi && bi.getBlock() instanceof SuitcaseBlock) {
+            CompoundTag beNbt = BlockItem.getBlockEntityData(stack);
+            if (beNbt == null || !beNbt.contains("BoundKeystone")) {
+                player.displayClientMessage(Component.literal("§c☒"), true);
+                world.playSound(null, player.getX(), player.getY(), player.getZ(), SoundEvents.ZOMBIE_ATTACK_WOODEN_DOOR, SoundSource.PLAYERS, 0.3f, 1.5f);
+                event.setCancellationResult(InteractionResult.FAIL);
+                event.setCanceled(true);
+                return;
             }
+            if (beNbt.getBoolean("Locked")) {
+                player.displayClientMessage(Component.literal("§c☒"), true);
+                world.playSound(null, player.getX(), player.getY(), player.getZ(), SoundEvents.ZOMBIE_ATTACK_WOODEN_DOOR, SoundSource.PLAYERS, 0.3f, 1.5f);
+                event.setCancellationResult(InteractionResult.FAIL);
+                event.setCanceled(true);
+                return;
             }
+            String keystone = beNbt.getString("BoundKeystone");
+            ResourceLocation dimId = ResourceLocation.fromNamespaceAndPath(MODID, "pocket_dimension_" + keystone);
+            ResourceKey<Level> dimKey = ResourceKey.create(Registries.DIMENSION, dimId);
+            ServerLevel targetWorld = world.getServer().getLevel(dimKey);
+            if (targetWorld == null) {
+                player.displayClientMessage(Component.literal("§cPocket dimension not found"), true);
+                event.setCancellationResult(InteractionResult.FAIL);
+                event.setCanceled(true);
+                return;
             }
+            if (!(entity instanceof LivingEntity mob)) {
+                return;
+            }
+            if (Config.isEntityBlacklisted(mob.getType())) {
+                player.displayClientMessage(Component.literal("§c☒"), true);
+                world.playSound(null, player.getX(), player.getY(), player.getZ(), SoundEvents.ZOMBIE_ATTACK_WOODEN_DOOR, SoundSource.PLAYERS, 0.3f, 1.5f);
+                event.setCancellationResult(InteractionResult.FAIL);
+                event.setCanceled(true);
+                return;
+            }
+            boolean isHostile = mob instanceof Enemy || (mob instanceof Wolf wolf && wolf.isAngryAtAllPlayers(world));
+            if (!Config.canCaptureHostile() && isHostile) {
+                player.displayClientMessage(Component.literal("§c☒"), true);
+                world.playSound(null, player.getX(), player.getY(), player.getZ(), SoundEvents.ZOMBIE_ATTACK_WOODEN_DOOR, SoundSource.PLAYERS, 0.3f, 1.5f);
+                event.setCancellationResult(InteractionResult.FAIL);
+                event.setCanceled(true);
+                return;
+            }
+            MobEntryData data = MobEntryData.get(targetWorld);
+            Vec3 dest = data.getEntryPos();
+            mob.changeDimension(targetWorld, new net.minecraftforge.common.util.ITeleporter() {
+                @Override
+                public Entity placeEntity(Entity entity, ServerLevel currentWorld, ServerLevel destWorld, float yaw, java.util.function.Function<Boolean, Entity> repositionEntity) {
+                    Entity e = repositionEntity.apply(false);
+                    e.teleportTo(dest.x, dest.y, dest.z);
+                    return e;
+                }
+            });
+            world.playSound(null, player.getX(), player.getY(), player.getZ(), SoundEvents.BUNDLE_DROP_CONTENTS, SoundSource.PLAYERS, 2.0f, 1.0f);
+            world.playSound(null, player.getX(), player.getY(), player.getZ(), SoundEvents.ITEM_PICKUP, SoundSource.PLAYERS, 0.5f, 1.0f);
+            event.setCancellationResult(InteractionResult.SUCCESS);
+            event.setCanceled(true);
+            return;
+        }
+        
+        if (stack.getItem() instanceof KeystoneItem) {
+            ResourceLocation dimId = world.dimension().location();
+            String namespace = dimId.getNamespace();
+            String path = dimId.getPath();
+            String prefix = "pocket_dimension_";
+            if (!namespace.equals(MODID) || !path.startsWith(prefix)) {
+                return;
+            }
+            String keystoneName = path.substring(prefix.length());
+            if (!(entity instanceof LivingEntity mob)) {
+                return;
+            }
+            String playerUuid = player.getUUID().toString();
+            BlockPos suitcasePos = SuitcaseBlockEntity.findSuitcasePosition(keystoneName, playerUuid);
+            if (suitcasePos == null) {
+                player.displayClientMessage(Component.literal("§cNo suitcase found"), true);
+                event.setCancellationResult(InteractionResult.FAIL);
+                event.setCanceled(true);
+                return;
+            }
+            ServerLevel overworld = world.getServer().getLevel(Level.OVERWORLD);
+            if (overworld == null) {
+                player.displayClientMessage(Component.literal("§cOverworld is not loaded"), true);
+                event.setCancellationResult(InteractionResult.FAIL);
+                event.setCanceled(true);
+                return;
+            }
+            Vec3 exitPos = new Vec3(suitcasePos.getX() + 0.5, suitcasePos.getY() + 0.5, suitcasePos.getZ() + 0.5);
+            mob.changeDimension(overworld, new net.minecraftforge.common.util.ITeleporter() {
+                @Override
+                public Entity placeEntity(Entity entity, ServerLevel currentWorld, ServerLevel destWorld, float yaw, java.util.function.Function<Boolean, Entity> repositionEntity) {
+                    Entity e = repositionEntity.apply(false);
+                    e.teleportTo(exitPos.x, exitPos.y, exitPos.z);
+                    return e;
+                }
+            });
+            overworld.playSound(null, exitPos.x, exitPos.y, exitPos.z, SoundEvents.BUNDLE_DROP_CONTENTS, SoundSource.PLAYERS, 2.0f, 1.0f);
+            world.playSound(null, player.getX(), player.getY(), player.getZ(), SoundEvents.BUNDLE_DROP_CONTENTS, SoundSource.PLAYERS, 2.0f, 1.0f);
+            event.setCancellationResult(InteractionResult.SUCCESS);
+            event.setCanceled(true);
         }
     }
 
-    private void onServerStarting(net.minecraftforge.event.server.ServerStartingEvent event) {
-        SuitcaseRegistryState state = SuitcaseRegistryState.getState(event.getServer());
-        SuitcaseBlockEntity.initializeSuitcaseRegistry(state.getRegistry());
-    }
+    @SubscribeEvent
+    public void onUseItem(PlayerInteractEvent.RightClickItem event) {
+        Level world = event.getLevel();
+        var player = event.getEntity();
+        var hand = event.getHand();
+        var stack = player.getItemInHand(hand);
 
-    private void onServerStopping(net.minecraftforge.event.server.ServerStoppingEvent event) {
-        SuitcaseRegistryState state = SuitcaseRegistryState.getState(event.getServer());
-        SuitcaseBlockEntity.saveSuitcaseRegistryTo(state.getRegistry());
-        state.setDirty();
+        if (world.isClientSide || hand != InteractionHand.MAIN_HAND) return;
+
+        if (!(world instanceof ServerLevel sw)) return;
+        var id = sw.dimension().location();
+        if (!id.getNamespace().equals(MODID) || !id.getPath().startsWith("pocket_dimension_")) return;
+
+        if (stack.getItem() == Items.BONE) {
+            Vec3 pos = player.position();
+            float yaw = player.getYRot();
+            float pitch = player.getXRot();
+            PlayerEntryData.get(sw).setEntry(pos, yaw, pitch);
+            player.sendSystemMessage(Component.literal(String.format("§aPlayer entry location set to %.1f, %.1f, %.1f", pos.x, pos.y, pos.z)));
+            event.setCancellationResult(InteractionResult.SUCCESS);
+            event.setCanceled(true);
+        } else if (stack.getItem() == Items.LEAD) {
+            Vec3 pos = player.position();
+            float yaw = player.getYRot();
+            float pitch = player.getXRot();
+            MobEntryData.get(sw).setEntry(pos, yaw, pitch);
+            player.sendSystemMessage(Component.literal(String.format("§aMob entry location set to %.1f, %.1f, %.1f", pos.x, pos.y, pos.z)));
+            event.setCancellationResult(InteractionResult.SUCCESS);
+            event.setCanceled(true);
+        }
     }
 }

src/main/java/io/lampnet/travelerssuitcase/block/ModBlocks.java

@@ -70,7 +70,7 @@ public class ModBlocks {
                     .sound(SoundType.LODESTONE)
                     .noOcclusion()
                     .lightLevel(getPortalLuminance())
-                    .strength(-1f)));
+                    .strength(5.0f)));
 
     private static <T extends Block> RegistryObject<T> registerBlock(String name, Supplier<T> blockSupplier) {
         RegistryObject<T> block = BLOCKS.register(name, blockSupplier);

src/main/java/io/lampnet/travelerssuitcase/block/PocketPortalBlock.java

@@ -4,12 +4,7 @@ import io.lampnet.travelerssuitcase.block.entity.SuitcaseBlockEntity;
 import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.block.entity.BlockEntity;
-import net.minecraft.world.entity.item.ItemEntity;
-import net.minecraft.world.item.BlockItem;
 import net.minecraft.world.item.ItemStack;
-import net.minecraft.nbt.CompoundTag;
-import net.minecraft.nbt.ListTag;
-import net.minecraft.nbt.StringTag;
 import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.sounds.SoundEvents;
@@ -17,116 +12,34 @@ import net.minecraft.sounds.SoundSource;
 import net.minecraft.network.chat.Component;
 import net.minecraft.ChatFormatting;
 import net.minecraft.core.BlockPos;
-import net.minecraft.world.phys.AABB;
 import net.minecraft.world.level.ChunkPos;
 import net.minecraft.world.phys.Vec3;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.entity.Entity;
-import net.minecraft.world.level.chunk.LevelChunk;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.world.level.block.state.BlockBehaviour;
-import net.minecraft.nbt.Tag;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.HashMap;
+import java.util.Collections;
 import java.util.List;
-import java.util.Map;
 import java.util.Objects;
+import net.minecraft.world.level.storage.loot.LootParams;
 
 public class PocketPortalBlock extends Block {
-    private static final Map<String, PlayerPositionData> LAST_KNOWN_POSITIONS = new HashMap<>();
-    private static final int SEARCH_RADIUS_CHUNKS = 12;
-    public static class PlayerPositionData {
-        public final double x;
-        public final double y;
-        public final double z;
-        public final float yaw;
-        public final float pitch;
-        public final long timestamp;
-        public PlayerPositionData(double x, double y, double z, float yaw, float pitch) {
-            this.x = x;
-            this.y = y;
-            this.z = z;
-            this.yaw = yaw;
-            this.pitch = pitch;
-            this.timestamp = System.currentTimeMillis();
-        }
-    }
 
     public PocketPortalBlock(BlockBehaviour.Properties properties) {
         super(properties);
     }
 
-    public static void storePlayerPosition(ServerPlayer player) {
-        LAST_KNOWN_POSITIONS.put(
-                player.getUUID().toString(),
-                new PlayerPositionData(player.getX(), player.getY(), player.getZ(), player.getYRot(), player.getXRot())
-        );
+    @Override
+    public List<ItemStack> getDrops(BlockState state, LootParams.Builder builder) {
+        return Collections.singletonList(new ItemStack(this));
     }
 
-    private boolean attemptPlayerInventorySuitcaseTeleport(Level world, ServerLevel overworld, ServerPlayer player, String keystoneName) {
-        for (ServerPlayer serverPlayer : Objects.requireNonNull(world.getServer()).getPlayerList().getPlayers()) {
-            if (scanPlayerInventoryForSuitcase(serverPlayer, player, keystoneName, world, overworld)) {
-                return true;
-            }
-        }
-        return false;
-    }
 
-    private boolean scanPlayerInventoryForSuitcase(ServerPlayer inventoryOwner, ServerPlayer exitingPlayer,
-                                                   String keystoneName, Level world, ServerLevel overworld) {
-        for (int i = 0; i < inventoryOwner.getInventory().getContainerSize(); i++) {
-            ItemStack stack = inventoryOwner.getInventory().getItem(i);
-            if (isSuitcaseItemWithKeystone(stack, keystoneName)) {
-                cleanUpSuitcaseItemNbt(stack, exitingPlayer, keystoneName);
-                inventoryOwner.getInventory().setItem(i, stack);
-                teleportToPosition(world, exitingPlayer, overworld,
-                        inventoryOwner.getX(), inventoryOwner.getY() + 1.0, inventoryOwner.getZ(),
-                        exitingPlayer.getYRot(), exitingPlayer.getXRot());
 
-                return true;
-            }
-        }
-        return false;
-    }
 
-    private boolean isSuitcaseItemWithKeystone(ItemStack stack, String keystoneName) {
-        if (stack.isEmpty() || !(stack.getItem() instanceof BlockItem) ||
-                !(((BlockItem) stack.getItem()).getBlock() instanceof SuitcaseBlock)) {
-            return false;
-        }
 
-        if (!stack.hasTag()) return false;
-        CompoundTag beTag = BlockItem.getBlockEntityData(stack);
-        if (beTag == null) return false;
-
-        return beTag.contains("BoundKeystone") && keystoneName.equals(beTag.getString("BoundKeystone"));
-    }
-
-    private void cleanUpSuitcaseItemNbt(ItemStack stack, ServerPlayer player, String keystoneName) {
-        if (!stack.hasTag()) return;
-        CompoundTag beTag = BlockItem.getBlockEntityData(stack);
-        if (beTag == null) return;
-        if (beTag.contains("EnteredPlayers", Tag.TAG_LIST)) {
-            ListTag playersList = beTag.getList("EnteredPlayers", Tag.TAG_COMPOUND);
-            ListTag newPlayersList = new ListTag();
-            boolean playerFound = false;
-            for (int i = 0; i < playersList.size(); i++) {
-                CompoundTag playerData = playersList.getCompound(i);
-                if (!player.getUUID().toString().equals(playerData.getString("UUID"))) {
-                    newPlayersList.add(playerData);
-                } else {
-                    playerFound = true;
-                }
-            }
-            if (playerFound) {
-                beTag.put("EnteredPlayers", newPlayersList);
-                int remainingPlayers = newPlayersList.size();
-                updateItemLore(stack, remainingPlayers);
-            }
-        }
-        SuitcaseBlockEntity.removeSuitcaseEntry(keystoneName, player.getUUID().toString());
-    }
 
     @Override
     public void entityInside(@NotNull BlockState state, Level world, @NotNull BlockPos pos, @NotNull Entity entity) {
@@ -140,36 +53,16 @@ public class PocketPortalBlock extends Block {
                 ServerLevel overworld = Objects.requireNonNull(world.getServer()).getLevel(Level.OVERWORLD);
                 if (overworld == null) return;
 
-                boolean teleported = false;
-
-                // Method 1: Try to teleport to the original suitcase block entity
-                teleported = attemptSuitcaseTeleport(world, overworld, player, keystoneName);
-
-                // Method 2: Try to find suitcase in a player's inventory (new method)
-                if (!teleported) {
-                    teleported = attemptPlayerInventorySuitcaseTeleport(world, overworld, player, keystoneName);
-                }
-
-                // Method 3: Try to find the suitcase as an item entity in the world
-                if (!teleported) {
-                    teleported = attemptSuitcaseItemTeleport(world, overworld, player, keystoneName);
-                }
-
-                // Method 4: Try to use player's last known position
-                if (!teleported) {
-                    teleported = attemptLastKnownPositionTeleport(world, overworld, player);
-                }
-
-                // Fallback: Take them to spawn
-                if (!teleported) {
-                    player.displayClientMessage(Component.literal("§cCouldn't find your return point. Taking you to spawn.").withStyle(ChatFormatting.RED), false);
+                // Primary method: Try to teleport to the suitcase block they entered from
+                if (!attemptSuitcaseTeleport(world, overworld, player, keystoneName)) {
+                    // Fallback: Take them to spawn if suitcase block cannot be found
+                    player.displayClientMessage(Component.literal("§c...").withStyle(ChatFormatting.RED), false);
                     teleportToPosition(world, player, overworld,
                             overworld.getSharedSpawnPos().getX() + 0.5,
                             overworld.getSharedSpawnPos().getY() + 1.0,
                             overworld.getSharedSpawnPos().getZ() + 0.5, 0, 0);
                 }
-                SuitcaseBlockEntity.removeSuitcaseEntry(keystoneName, player.getUUID().toString());
-                LAST_KNOWN_POSITIONS.remove(player.getUUID().toString());
+                SuitcaseBlockEntity.removeSuitcaseEntry(keystoneName, player.getUUID().toString(), world.getServer());
             }
         }
     }
@@ -180,10 +73,11 @@ public class PocketPortalBlock extends Block {
         player.fallDistance = 0f;
     }
 
-    // Method 1: Try to teleport to the original suitcase block entity
+    // Teleport to the suitcase block coordinates they entered from
     private boolean attemptSuitcaseTeleport(Level world, ServerLevel overworld, ServerPlayer player, String keystoneName) {
         BlockPos suitcasePos = SuitcaseBlockEntity.findSuitcasePosition(keystoneName, player.getUUID().toString());
         if (suitcasePos == null) return false;
+        
         ChunkPos suitcaseChunkPos = new ChunkPos(suitcasePos);
         overworld.setChunkForced(suitcaseChunkPos.x, suitcaseChunkPos.z, true);
         try {
@@ -191,7 +85,10 @@ public class PocketPortalBlock extends Block {
             if (targetEntity instanceof SuitcaseBlockEntity suitcase) {
                 SuitcaseBlockEntity.EnteredPlayerData exitData = suitcase.getExitPosition(player.getUUID().toString());
                 if (exitData != null) {
-                    teleportToPosition(world, player, overworld, exitData.x(), exitData.y(), exitData.z(), exitData.yaw(), player.getXRot());
+                    // Teleport to the suitcase block position (not the original player position)
+                    teleportToPosition(world, player, overworld, 
+                            suitcasePos.getX() + 0.5, suitcasePos.getY() + 1.0, suitcasePos.getZ() + 0.5, 
+                            exitData.yaw(), player.getXRot());
                     Objects.requireNonNull(world.getServer()).execute(() -> {
                         overworld.setChunkForced(suitcaseChunkPos.x, suitcaseChunkPos.z, false);
                     });
@@ -204,105 +101,24 @@ public class PocketPortalBlock extends Block {
         return false;
     }
 
-    // Method 2: Try to find the suitcase as an item entity in the world
-    private boolean attemptSuitcaseItemTeleport(Level world, ServerLevel overworld, ServerPlayer player, String keystoneName) {
-        BlockPos searchCenter;
-        BlockPos suitcasePos = SuitcaseBlockEntity.findSuitcasePosition(keystoneName, player.getUUID().toString());
-        if (suitcasePos != null) {
-            searchCenter = suitcasePos;
-        } else {
-            PlayerPositionData lastPos = LAST_KNOWN_POSITIONS.get(player.getUUID().toString());
-            if (lastPos != null) {
-                searchCenter = new BlockPos((int)lastPos.x, (int)lastPos.y, (int)lastPos.z);
-            } else {
-                searchCenter = overworld.getSharedSpawnPos();
-            }
-        }
-        int centerX = searchCenter.getX() >> 4;
-        int centerZ = searchCenter.getZ() >> 4;
-        for (int radius = 0; radius <= SEARCH_RADIUS_CHUNKS; radius++) {
-            for (int x = centerX - radius; x <= centerX + radius; x++) {
-                for (int z = centerZ - radius; z <= centerZ + radius; z++) {
-                    if (radius > 0 && x > centerX - radius && x < centerX + radius &&
-                            z > centerZ - radius && z < centerZ + radius) {
-                        continue;
-                    }
-                    if (!overworld.hasChunk(x, z)) {
-                        continue;
-                    }
-                    LevelChunk chunk = overworld.getChunk(x, z);
-                    List<ItemEntity> itemEntities = overworld.getEntitiesOfClass(
-                            ItemEntity.class,
-                            new AABB(chunk.getPos().getMinBlockX(), overworld.getMinBuildHeight(), chunk.getPos().getMinBlockZ(),
-                                    chunk.getPos().getMaxBlockX(), overworld.getMaxBuildHeight(), chunk.getPos().getMaxBlockZ()),
-                            itemEntity -> {
-                                ItemStack stack = itemEntity.getItem();
-                                CompoundTag beTag = BlockItem.getBlockEntityData(stack);
-                                if (beTag == null) return false;
 
-                                return beTag.contains("BoundKeystone") &&
-                                        keystoneName.equals(beTag.getString("BoundKeystone"));
-                            }
-                    );
-                    if (!itemEntities.isEmpty()) {
-                        ItemEntity suitcaseItemEntity = itemEntities.get(0);
-                        cleanUpSuitcaseItemNbt(suitcaseItemEntity.getItem(), player, keystoneName);
-                        suitcaseItemEntity.setItem(suitcaseItemEntity.getItem());
-                        teleportToPosition(world, player, overworld,
-                                suitcaseItemEntity.getX(), suitcaseItemEntity.getY() + 1.0, suitcaseItemEntity.getZ(),
-                                player.getYRot(), player.getXRot());
-                        return true;
-                    }
-                }
-            }
-        }
-        return false;
-    }
-
-    // Method 3: Try to use player's last known position
-    private boolean attemptLastKnownPositionTeleport(Level world, ServerLevel overworld, ServerPlayer player) {
-        PlayerPositionData lastPos = LAST_KNOWN_POSITIONS.get(player.getUUID().toString());
-        if (lastPos != null) {
-            long currentTime = System.currentTimeMillis();
-            if (currentTime - lastPos.timestamp > 10 * 60 * 1000) {
-                return false;
-            }
-            player.displayClientMessage(Component.literal("§6Returning to your last known position."), false);
-            teleportToPosition(world, player, overworld,
-                    lastPos.x, lastPos.y, lastPos.z,
-                    lastPos.yaw, lastPos.pitch);
-            return true;
-        }
-        return false;
-    }
 
     private void teleportToPosition(Level world, ServerPlayer player, ServerLevel targetWorld,
                                     double x, double y, double z, float yaw, float pitch) {
-        player.teleportTo(targetWorld, x, y, z, yaw, pitch);
+        if (!world.isClientSide) {
+            // Use changeDimension instead of teleportTo to avoid "Player moved wrongly" errors
+            player.changeDimension(targetWorld, new net.minecraftforge.common.util.ITeleporter() {
+                @Override
+                public Entity placeEntity(Entity entity, ServerLevel currentWorld, ServerLevel destWorld, float placementYaw, java.util.function.Function<Boolean, Entity> repositionEntity) {
+                    Entity e = repositionEntity.apply(false);
+                    e.teleportTo(x, y, z);
+                    e.setYRot(yaw);
+                    e.setXRot(pitch);
+                    return e;
+                }
+            });
+        }
     }
 
-    private void updateItemLore(ItemStack stack, int playerCount) {
-        if (stack.hasTag()) {
-            assert stack.getTag() != null;
-            if (stack.getTag().contains("display")) {
-                CompoundTag display = stack.getTag().getCompound("display");
-                if (display.contains("Lore", Tag.TAG_LIST)) {
-                    ListTag lore = display.getList("Lore", Tag.TAG_STRING);
-                    ListTag newLore = new ListTag();
-                    for (int i = 0; i < lore.size(); i++) {
-                        String loreStr = lore.getString(i);
-                        if (!loreStr.contains("traveler")) {
-                            newLore.add(lore.get(i));
-                        }
-                    }
-                    if (playerCount > 0) {
-                        Component warningText = Component.literal("§c⚠ Contains " + playerCount + " traveler(s)!")
-                                .withStyle(ChatFormatting.RED);
-                        newLore.add(0, StringTag.valueOf(Component.Serializer.toJson(warningText)));
-                    }
-                    display.put("Lore", newLore);
-                }
-            }
-        }
-    }
+
 }

src/main/java/io/lampnet/travelerssuitcase/block/SuitcaseBlock.java

@@ -3,6 +3,7 @@ package io.lampnet.travelerssuitcase.block;
 import io.lampnet.travelerssuitcase.TravelersSuitcase;
 import io.lampnet.travelerssuitcase.block.entity.ModBlockEntities;
 import io.lampnet.travelerssuitcase.block.entity.SuitcaseBlockEntity;
+import io.lampnet.travelerssuitcase.data.PlayerEntryData;
 import io.lampnet.travelerssuitcase.item.KeystoneItem;
 import net.minecraft.world.level.block.BaseEntityBlock;
 import net.minecraft.world.level.block.Block;
@@ -44,10 +45,12 @@ import net.minecraft.world.phys.Vec3;
 import net.minecraft.world.phys.shapes.CollisionContext;
 import net.minecraft.world.phys.shapes.VoxelShape;
 import net.minecraft.world.level.BlockGetter;
+import net.minecraft.world.level.ChunkPos;
 import net.minecraft.world.level.Level;
-import net.minecraft.world.Containers;
 import net.minecraft.world.item.DyeColor;
 
+import net.minecraft.network.protocol.game.ClientboundStopSoundPacket;
+
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -62,6 +65,8 @@ public class SuitcaseBlock extends BaseEntityBlock {
     private final static VoxelShape SHAPE_E = Block.box(2, 0, 0, 14, 4, 16);
     private final static VoxelShape SHAPE_W = Block.box(2, 0, 0, 14, 4, 16);
     
+
+
     public SuitcaseBlock(BlockBehaviour.Properties properties) {
         super(properties);
         this.registerDefaultState(this.stateDefinition.any()
@@ -114,42 +119,6 @@ public class SuitcaseBlock extends BaseEntityBlock {
     @Override
     public void onRemove(BlockState state, @NotNull Level world, @NotNull BlockPos pos, BlockState newState, boolean isMoving) {
         if (!state.is(newState.getBlock())) {
-            BlockEntity blockEntity = world.getBlockEntity(pos);
-            if (blockEntity instanceof SuitcaseBlockEntity suitcase) {
-                ItemStack itemStack = new ItemStack(this);
-                String boundKeystone = suitcase.getBoundKeystoneName();
-                if (boundKeystone != null) {
-                    CompoundTag beNbt = new CompoundTag();
-                    suitcase.saveAdditional(beNbt);
-                    
-                    if (!beNbt.isEmpty()) {
-                        BlockItem.setBlockEntityData(itemStack, ModBlockEntities.SUITCASE_BLOCK_ENTITY.get(), beNbt);
-                    }
-
-                    CompoundTag display = itemStack.getOrCreateTagElement("display");
-                    ListTag lore = new ListTag();
-                    String displayName = boundKeystone.replace("_", " ");
-                    Component boundText;
-                    if (suitcase.isLocked()) {
-                        boundText = Component.literal("Bound to: §k" + displayName)
-                                .withStyle(ChatFormatting.GRAY);
-                    } else {
-                        boundText = Component.literal("Bound to: " + displayName)
-                                .withStyle(ChatFormatting.GRAY);
-                    }
-                    Component lockText = Component.literal(suitcase.isLocked() ? "§cLocked" : "§aUnlocked")
-                            .withStyle(ChatFormatting.GRAY);
-                    if (!suitcase.getEnteredPlayers().isEmpty()) {
-                        Component warningText = Component.literal("§c⚠ Contains " + suitcase.getEnteredPlayers().size() + " Traveler's!")
-                                .withStyle(ChatFormatting.RED);
-                        lore.add(StringTag.valueOf(Component.Serializer.toJson(warningText)));
-                    }
-                    lore.add(StringTag.valueOf(Component.Serializer.toJson(boundText)));
-                    lore.add(StringTag.valueOf(Component.Serializer.toJson(lockText)));
-                    display.put("Lore", lore);
-                }
-                Containers.dropItemStack(world, pos.getX(), pos.getY(), pos.getZ(), itemStack);
-            }
             super.onRemove(state, world, pos, newState, isMoving);
         }
     }
@@ -243,24 +212,72 @@ public class SuitcaseBlock extends BaseEntityBlock {
                 return;
             }
             String dimensionName = "pocket_dimension_" + keystoneName;
-            ResourceLocation dimensionRL = new ResourceLocation(TravelersSuitcase.MODID, dimensionName);
+                                    ResourceLocation dimensionRL = ResourceLocation.fromNamespaceAndPath(TravelersSuitcase.MODID, dimensionName);
             ResourceKey<Level> dimensionKey = ResourceKey.create(Registries.DIMENSION, dimensionRL);
             ServerLevel targetWorld = Objects.requireNonNull(world.getServer()).getLevel(dimensionKey);
             if (targetWorld != null) {
+                boolean wasFirstTime = suitcase.isFirstTimeEntering(player);
                 suitcase.playerEntered(player);
+                if (wasFirstTime) {
+                    TravelersSuitcase.ENTER_POCKET_DIMENSION.trigger(player);
+                }
+
                 player.stopRiding();
                 player.setDeltaMovement(Vec3.ZERO);
                 player.fallDistance = 0f;
-                player.teleportTo(targetWorld, 17.5, 97, 9.5, player.getYRot(), player.getXRot());
-                world.playSound(null, pos,
+
+                PlayerEntryData ped = PlayerEntryData.get(targetWorld);
+                
+                // Use default position (17, 97, 9) unless manually configured
+                if (!ped.isManuallySet()) {
+                    ped.setEntryAutomatic(new Vec3(17.5, 97.0, 9.5), 0f, 0f);
+                }
+                
+                Vec3 dest = ped.getEntryPos();
+                float entryYaw = ped.getEntryYaw();
+                float pitch = player.getXRot();
+
+                // Ensure destination chunk is loaded before teleportation
+                ChunkPos destChunkPos = new ChunkPos(BlockPos.containing(dest));
+                targetWorld.setChunkForced(destChunkPos.x, destChunkPos.z, true);
+                
+                try {
+                    // Use changeDimension instead of teleportTo to avoid "Player moved wrongly" errors
+                    player.changeDimension(targetWorld, new net.minecraftforge.common.util.ITeleporter() {
+                        @Override
+                        public Entity placeEntity(Entity entity, ServerLevel currentWorld, ServerLevel destWorld, float placementYaw, java.util.function.Function<Boolean, Entity> repositionEntity) {
+                            Entity e = repositionEntity.apply(false);
+                            e.teleportTo(dest.x, dest.y, dest.z);
+                            e.setYRot(entryYaw);
+                            e.setXRot(pitch);
+                            return e;
+                        }
+                    });
+                    
+                    // Schedule chunk unforcing on next tick to allow proper entity placement
+                    Objects.requireNonNull(world.getServer()).execute(() -> {
+                        targetWorld.setChunkForced(destChunkPos.x, destChunkPos.z, false);
+                    });
+                } finally {
+                    // Ensure chunk is unforced even if teleportation fails
+                    targetWorld.setChunkForced(destChunkPos.x, destChunkPos.z, false);
+                }
+
+                player.connection.send(new ClientboundStopSoundPacket(null, null));
+
+                world.playSound(
+                        null,
+                        pos.getX() + 0.5, pos.getY() + 0.5, pos.getZ() + 0.5,
                         SoundEvents.BUNDLE_DROP_CONTENTS,
-                        SoundSource.PLAYERS, 2.0f, 1.0f);
-            } else {
-                TravelersSuitcase.LOGGER.warn("Target dimension {} not found for keystone {}", dimensionRL, keystoneName);
+                        SoundSource.PLAYERS,
+                        2.0f, 1.0f
+                );
             }
         }
     }
 
+
+
     @Override
     public @NotNull VoxelShape getShape(BlockState state, @NotNull BlockGetter world, @NotNull BlockPos pos, @NotNull CollisionContext context) {
         return switch (state.getValue(FACING)) {
@@ -295,7 +312,7 @@ public class SuitcaseBlock extends BaseEntityBlock {
                 CompoundTag display = stack.getOrCreateTagElement("display");
                 ListTag lore = new ListTag();
                 if (!suitcase.getEnteredPlayers().isEmpty()) {
-                    Component warningText = Component.literal("§c⚠ Contains " + suitcase.getEnteredPlayers().size() + " Traveler's!")
+                    Component warningText = Component.literal("§c⚠ Contains " + suitcase.getEnteredPlayers().size() + " Travelers!")
                             .withStyle(ChatFormatting.RED);
                     lore.add(StringTag.valueOf(Component.Serializer.toJson(warningText)));
                 }

src/main/java/io/lampnet/travelerssuitcase/block/entity/SuitcaseBlockEntity.java

@@ -1,6 +1,6 @@
 package io.lampnet.travelerssuitcase.block.entity;
 
-import io.lampnet.travelerssuitcase.block.PocketPortalBlock;
+
 import net.minecraft.core.BlockPos;
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.nbt.ListTag;
@@ -16,6 +16,9 @@ import org.jetbrains.annotations.Nullable;
 
 import java.util.*;
 
+import io.lampnet.travelerssuitcase.SuitcaseRegistryState;
+import net.minecraft.server.MinecraftServer;
+
 public class SuitcaseBlockEntity extends BlockEntity {
     private String boundKeystoneName;
     private boolean isLocked = false;
@@ -70,6 +73,11 @@ public class SuitcaseBlockEntity extends BlockEntity {
         return dimensionLocked;
     }
 
+    private static final java.util.Set<java.util.UUID> PLAYERS_WHO_ENTERED = new java.util.HashSet<>();
+    public boolean isFirstTimeEntering(ServerPlayer player) {
+        return !PLAYERS_WHO_ENTERED.contains(player.getUUID());
+    }
+
     public void playerEntered(ServerPlayer player) {
         enteredPlayers.removeIf(data -> data.uuid.equals(player.getUUID().toString()));
         EnteredPlayerData data = new EnteredPlayerData(
@@ -79,14 +87,22 @@ public class SuitcaseBlockEntity extends BlockEntity {
                 this.worldPosition
         );
         enteredPlayers.add(data);
+
+        PLAYERS_WHO_ENTERED.add(player.getUUID());
+
         if (boundKeystoneName != null) {
             Map<String, BlockPos> suitcases = SUITCASE_REGISTRY.computeIfAbsent(
                     boundKeystoneName, k -> new HashMap<>()
             );
             suitcases.put(player.getUUID().toString(), this.worldPosition);
         }
-        PocketPortalBlock.storePlayerPosition(player);
+
         setChangedAndNotify();
+
+        MinecraftServer server = player.getServer();
+        if (server != null) {
+            SuitcaseRegistryState.onRegistryChanged(server);
+        }
     }
 
     public EnteredPlayerData getExitPosition(String playerUuid) {
@@ -95,9 +111,9 @@ public class SuitcaseBlockEntity extends BlockEntity {
             if (data.uuid.equals(playerUuid)) {
                 EnteredPlayerData exitData = new EnteredPlayerData(
                         data.uuid,
-                        this.worldPosition.getX() + 0.5, this.worldPosition.getY() + 1.0, this.worldPosition.getZ() + 0.5,
+                        data.x, data.y, data.z,
                         data.pitch, data.yaw,
-                        this.worldPosition
+                        data.suitcasePos != null ? data.suitcasePos : this.worldPosition
                 );
                 enteredPlayers.remove(i);
                 setChangedAndNotify();
@@ -171,7 +187,11 @@ public class SuitcaseBlockEntity extends BlockEntity {
     @Override
     public @NotNull CompoundTag getUpdateTag() {
         CompoundTag nbt = new CompoundTag();
-        this.saveAdditional(nbt);
+        if (boundKeystoneName != null) {
+            nbt.putString("BoundKeystone", boundKeystoneName);
+        }
+        nbt.putBoolean("Locked", isLocked);
+        nbt.putBoolean("DimensionLocked", dimensionLocked);
         return nbt;
     }
 
@@ -182,13 +202,16 @@ public class SuitcaseBlockEntity extends BlockEntity {
         return (suitcases != null) ? suitcases.get(playerUuid) : null;
     }
 
-    public static void removeSuitcaseEntry(String keystoneName, String playerUuid) {
+    public static void removeSuitcaseEntry(String keystoneName, String playerUuid, MinecraftServer server) {
         Map<String, BlockPos> suitcases = SUITCASE_REGISTRY.get(keystoneName);
         if (suitcases != null) {
             suitcases.remove(playerUuid);
             if (suitcases.isEmpty()) {
                 SUITCASE_REGISTRY.remove(keystoneName);
             }
+            if (server != null) {
+                SuitcaseRegistryState.onRegistryChanged(server);
+            }
         }
     }
 

src/main/java/io/lampnet/travelerssuitcase/criterion/EnterPocketDimensionCriterion.java

@@ -0,0 +1,37 @@
+package io.lampnet.travelerssuitcase.criterion;
+
+import com.google.gson.JsonObject;
+import io.lampnet.travelerssuitcase.TravelersSuitcase;
+import net.minecraft.advancements.critereon.AbstractCriterionTriggerInstance;
+import net.minecraft.advancements.critereon.ContextAwarePredicate;
+import net.minecraft.advancements.critereon.SimpleCriterionTrigger;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.level.ServerPlayer;
+
+public class EnterPocketDimensionCriterion extends SimpleCriterionTrigger<EnterPocketDimensionCriterion.TriggerInstance> {
+    static final ResourceLocation ID = ResourceLocation.fromNamespaceAndPath(TravelersSuitcase.MODID, "enter_pocket_dimension");
+
+    @Override
+    public ResourceLocation getId() {
+        return ID;
+    }
+
+    @Override
+    public TriggerInstance createInstance(JsonObject jsonObject, ContextAwarePredicate contextAwarePredicate, net.minecraft.advancements.critereon.DeserializationContext deserializationContext) {
+        return new TriggerInstance(contextAwarePredicate);
+    }
+
+    public void trigger(ServerPlayer player) {
+        this.trigger(player, (triggerInstance) -> true);
+    }
+
+    public static class TriggerInstance extends AbstractCriterionTriggerInstance {
+        public TriggerInstance(ContextAwarePredicate player) {
+            super(EnterPocketDimensionCriterion.ID, player);
+        }
+
+        public JsonObject serializeToJson(net.minecraft.advancements.critereon.SerializationContext serializationContext) {
+            return super.serializeToJson(serializationContext);
+        }
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/data/MobEntryData.java

@@ -0,0 +1,55 @@
+package io.lampnet.travelerssuitcase.data;
+
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.saveddata.SavedData;
+import net.minecraft.world.phys.Vec3;
+
+public class MobEntryData extends SavedData {
+    private static final String DATA_KEY = "pocket_entry_data";
+    private Vec3 entryPos;
+    private float entryYaw, entryPitch;
+
+    public MobEntryData() {
+        super();
+        this.entryPos   = new Vec3(35.5, 85, 16.5);
+        this.entryYaw   = 0f;
+        this.entryPitch = 0f;
+    }
+    
+    public static MobEntryData load(CompoundTag nbt) {
+        MobEntryData data = new MobEntryData();
+        double x = nbt.getDouble("entryX");
+        double y = nbt.getDouble("entryY");
+        double z = nbt.getDouble("entryZ");
+        data.entryPos = new Vec3(x, y, z);
+        data.entryYaw   = nbt.getFloat("entryYaw");
+        data.entryPitch = nbt.getFloat("entryPitch");
+        return data;
+    }
+
+    public static MobEntryData get(ServerLevel world) {
+        return world.getDataStorage().computeIfAbsent(MobEntryData::load, MobEntryData::new, DATA_KEY);
+    }
+
+    @Override
+    public CompoundTag save(CompoundTag nbt) {
+        nbt.putDouble("entryX",   entryPos.x);
+        nbt.putDouble("entryY",   entryPos.y);
+        nbt.putDouble("entryZ",   entryPos.z);
+        nbt.putFloat( "entryYaw",   entryYaw);
+        nbt.putFloat( "entryPitch", entryPitch);
+        return nbt;
+    }
+
+    public void setEntry(Vec3 pos, float yaw, float pitch) {
+        this.entryPos   = pos;
+        this.entryYaw   = yaw;
+        this.entryPitch = pitch;
+        this.setDirty();
+    }
+
+    public Vec3 getEntryPos()   { return entryPos; }
+    public float getEntryYaw()    { return entryYaw; }
+    public float getEntryPitch()  { return entryPitch; }
+} 

src/main/java/io/lampnet/travelerssuitcase/data/PlayerEntryData.java

@@ -0,0 +1,77 @@
+package io.lampnet.travelerssuitcase.data;
+
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.saveddata.SavedData;
+import net.minecraft.world.phys.Vec3;
+
+public class PlayerEntryData extends SavedData {
+    private static final String DATA_KEY = "pocket_player_entry";
+
+    private Vec3 entryPos;
+    private float entryYaw, entryPitch;
+    private boolean isManuallySet = false;
+
+    public PlayerEntryData() {
+        super();
+        this.entryPos   = new Vec3(17.5, 97, 9.5);
+        this.entryYaw   = 0f;
+        this.entryPitch = 0f;
+    }
+
+    public static PlayerEntryData load(CompoundTag nbt) {
+        PlayerEntryData data = new PlayerEntryData();
+        data.entryPos   = new Vec3(
+                nbt.getDouble("px"),
+                nbt.getDouble("py"),
+                nbt.getDouble("pz")
+        );
+        data.entryYaw   = nbt.getFloat("pyaw");
+        data.entryPitch = nbt.getFloat("ppitch");
+        data.isManuallySet = nbt.getBoolean("manually_set");
+        return data;
+    }
+
+    public static PlayerEntryData get(ServerLevel world) {
+        return world.getDataStorage().computeIfAbsent(PlayerEntryData::load, PlayerEntryData::new, DATA_KEY);
+    }
+
+    @Override
+    public CompoundTag save(CompoundTag nbt) {
+        nbt.putDouble("px",    entryPos.x);
+        nbt.putDouble("py",    entryPos.y);
+        nbt.putDouble("pz",    entryPos.z);
+        nbt.putFloat( "pyaw",  entryYaw);
+        nbt.putFloat( "ppitch", entryPitch);
+        nbt.putBoolean("manually_set", isManuallySet);
+        return nbt;
+    }
+
+    public void setEntry(Vec3 pos, float yaw, float pitch) {
+        this.entryPos   = pos;
+        this.entryYaw   = yaw;
+        this.entryPitch = pitch;
+        this.isManuallySet = true;
+        this.setDirty();
+    }
+
+    public void setEntryAutomatic(Vec3 pos, float yaw, float pitch) {
+        this.entryPos   = pos;
+        this.entryYaw   = yaw;
+        this.entryPitch = pitch;
+        this.setDirty();
+    }
+
+    public void resetToDefault() {
+        this.entryPos = new Vec3(17.5, 97.0, 9.5);
+        this.entryYaw = 0f;
+        this.entryPitch = 0f;
+        this.isManuallySet = false;
+        this.setDirty();
+    }
+
+    public Vec3   getEntryPos()   { return entryPos; }
+    public float   getEntryYaw()    { return entryYaw; }
+    public float   getEntryPitch()  { return entryPitch; }
+    public boolean isManuallySet() { return isManuallySet; }
+} 

src/main/java/io/lampnet/travelerssuitcase/item/KeystoneItem.java

@@ -1,26 +1,42 @@
 package io.lampnet.travelerssuitcase.item;
 
 import io.lampnet.travelerssuitcase.TravelersSuitcase;
+import io.lampnet.travelerssuitcase.world.Fantasy;
+
+import io.lampnet.travelerssuitcase.world.FantasyWorldAccess;
+import io.lampnet.travelerssuitcase.world.PortalChunkGenerator;
+import io.lampnet.travelerssuitcase.world.RuntimeWorldConfig;
+import io.lampnet.travelerssuitcase.world.RuntimeWorldHandle;
 import net.minecraft.ChatFormatting;
-import net.minecraft.world.item.TooltipFlag;
-import net.minecraft.world.item.enchantment.Enchantments;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.network.chat.Component;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.sounds.SoundEvents;
+import net.minecraft.sounds.SoundSource;
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.InteractionResultHolder;
 import net.minecraft.world.entity.Entity;
 import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.item.Item;
 import net.minecraft.world.item.ItemStack;
-import net.minecraft.nbt.CompoundTag;
-import net.minecraft.server.MinecraftServer;
-import net.minecraft.sounds.SoundSource;
-import net.minecraft.sounds.SoundEvents;
-import net.minecraft.network.chat.Component;
-import net.minecraft.world.InteractionHand;
-import net.minecraft.world.InteractionResultHolder;
+import net.minecraft.world.item.TooltipFlag;
+import net.minecraft.world.item.enchantment.Enchantments;
 import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.Mirror;
+import net.minecraft.world.level.block.Rotation;
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.level.ChunkPos;
+import net.minecraft.world.level.chunk.ChunkStatus;
+import net.minecraft.server.level.TicketType;
+import net.minecraft.world.level.levelgen.structure.templatesystem.StructurePlaceSettings;
+import net.minecraft.world.level.levelgen.structure.templatesystem.StructureTemplate;
 import net.minecraft.world.level.storage.LevelResource;
-import net.minecraft.resources.ResourceLocation;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
-import net.minecraft.world.item.ItemStack.TooltipPart;
 
 import java.io.IOException;
 import java.nio.file.Files;
@@ -39,35 +55,111 @@ public class KeystoneItem extends Item {
     @Override
     public @NotNull InteractionResultHolder<ItemStack> use(@NotNull Level world, Player player, @NotNull InteractionHand hand) {
         ItemStack stack = player.getItemInHand(hand);
-        String keystoneName = stack.hasCustomHoverName() ? stack.getHoverName().getString().toLowerCase() : "";
-        String defaultName = "item.travelerssuitcase.keystone";
-        if (!stack.hasCustomHoverName() || keystoneName.isEmpty() || keystoneName.equals(Component.translatable(defaultName).getString().toLowerCase())) {
-            return InteractionResultHolder.pass(stack);
-        }
-        if (world.isClientSide) {
-            return InteractionResultHolder.success(stack);
-        }
+        
         if (stack.isEnchanted()) {
             return InteractionResultHolder.pass(stack);
         }
-        String dimensionName = "pocket_dimension_" + keystoneName.replaceAll("[^a-z0-9_]", "");
-        createDimension(world.getServer(), dimensionName);
-        stack.enchant(Enchantments.BINDING_CURSE, 1);
-        stack.hideTooltipPart(TooltipPart.ENCHANTMENTS);
-        stack.hideTooltipPart(TooltipPart.MODIFIERS);
-        CompoundTag nbt = stack.getOrCreateTag();
-        nbt.putInt("RepairCost", 32767);
-        world.playSound(null, player.getX(), player.getY(), player.getZ(),
-                SoundEvents.AMETHYST_CLUSTER_FALL, SoundSource.PLAYERS, 2.0F, 2.0F);
+        
+        if (!isValidKeystone(stack)) {
+            return InteractionResultHolder.pass(stack);
+        }
+
         return InteractionResultHolder.success(stack);
     }
 
+    private void createOrLoadPersistentDimension(MinecraftServer server, String dimensionName) {
+        ResourceLocation worldId = ResourceLocation.fromNamespaceAndPath(TravelersSuitcase.MODID, dimensionName);
+
+        Path worldSavePath = server.getWorldPath(LevelResource.ROOT)
+                .resolve("dimensions")
+                .resolve(TravelersSuitcase.MODID)
+                .resolve(dimensionName);
+        boolean dimensionExists = Files.exists(worldSavePath);
+
+        var biomeRegistry = server.registryAccess().registryOrThrow(Registries.BIOME);
+        
+        RuntimeWorldConfig config = new RuntimeWorldConfig()
+                .setGenerator(new PortalChunkGenerator(biomeRegistry))
+                .setSeed(server.overworld().getSeed());
+
+        RuntimeWorldHandle handle = Fantasy.get(server)
+                .getOrOpenPersistentWorld(worldId, config);
+        
+        handle.setTickWhenEmpty(true);
+        
+        TravelersSuitcase.LOGGER.info("Created/loaded pocket dimension '{}', ticking enabled: {}", 
+            dimensionName, ((FantasyWorldAccess) handle.asWorld()).fantasy$shouldTick());
+
+        registerDimension(server, dimensionName);
+
+        if (!dimensionExists) {
+            ServerLevel world = handle.asWorld();
+            server.execute(() -> placeStructureDelayed(server, world, dimensionName));
+        }
+    }
+
+    private void placeStructureDelayed(MinecraftServer server, ServerLevel world, String dimensionName) {
+        try {
+            StructureTemplate template = server.getStructureManager()
+                                            .get(ResourceLocation.fromNamespaceAndPath(TravelersSuitcase.MODID, "pocket_island_01"))
+                    .orElse(null);
+
+            if (template != null) {
+                BlockPos pos = new BlockPos(0, 64, 0);
+
+                ChunkPos chunkPos = new ChunkPos(pos);
+                world.getChunkSource().addRegionTicket(TicketType.UNKNOWN, chunkPos, 2, chunkPos);
+                world.getChunk(pos.getX() >> 4, pos.getZ() >> 4, ChunkStatus.FULL, true);
+                
+                template.placeInWorld(
+                        world,
+                        pos,
+                        pos,
+                        new StructurePlaceSettings()
+                                .setMirror(Mirror.NONE)
+                                .setRotation(Rotation.NONE)
+                                .setIgnoreEntities(false),
+                        world.getRandom(),
+                        Block.UPDATE_ALL
+                );
+                
+                world.setChunkForced(pos.getX() >> 4, pos.getZ() >> 4, true);
+
+                world.save(null, true, false);
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    private void registerDimension(MinecraftServer server, String dimensionName) {
+        Path registryDir = server.getWorldPath(LevelResource.ROOT)
+                .resolve("data")
+                .resolve(TravelersSuitcase.MODID)
+                .resolve("dimension_registry");
+
+        try {
+            Files.createDirectories(registryDir);
+            Path registryFile = registryDir.resolve("registry.txt");
+
+            Set<String> dims = new HashSet<>();
+            if (Files.exists(registryFile)) {
+                dims.addAll(Files.readAllLines(registryFile));
+            }
+
+            if (dims.add(dimensionName)) {
+                Files.write(registryFile, dims);
+            }
+        } catch (IOException e) {
+            TravelersSuitcase.LOGGER.error("Failed to write dimension registry", e);
+        }
+    }
+
     public static boolean isValidKeystone(ItemStack stack) {
         String keystoneName = stack.hasCustomHoverName() ? stack.getHoverName().getString().toLowerCase() : "";
         String defaultNameKey = "item.travelerssuitcase.keystone";
         return stack.hasCustomHoverName() && !keystoneName.isEmpty() &&
-                !keystoneName.equals(Component.translatable(defaultNameKey).getString().toLowerCase()) &&
-                stack.isEnchanted();
+                !keystoneName.equals(Component.translatable(defaultNameKey).getString().toLowerCase());
     }
 
     @Override
@@ -84,104 +176,37 @@ public class KeystoneItem extends Item {
     public void inventoryTick(ItemStack stack, @NotNull Level world, @NotNull Entity entity, int slot, boolean selected) {
         String keystoneName = stack.hasCustomHoverName() ? stack.getHoverName().getString().toLowerCase() : "";
         String defaultNameKey = "item.travelerssuitcase.keystone";
-        if (!stack.hasCustomHoverName() || keystoneName.isEmpty() ||
-            keystoneName.equals(Component.translatable(defaultNameKey).getString().toLowerCase())) {
+        boolean hasValidName = isValidKeystone(stack);
+        
+        if (!hasValidName) {
             CompoundTag nbt = stack.getOrCreateTag();
             nbt.putInt("CustomModelData", 1);
         } else if (stack.getTag() != null && stack.getTag().contains("CustomModelData")) {
             stack.getTag().remove("CustomModelData");
         }
-    }
 
-    private boolean createDimension(MinecraftServer server, String dimensionName) {
-        if (server == null) {
-            TravelersSuitcase.LOGGER.error("Failed to create dimension: " + dimensionName + " (MinecraftServer instance is null)");
-            return false;
-        }
-        try {
-            Path datapackPath = server.getWorldPath(LevelResource.ROOT)
-                    .resolve("datapacks")
-                    .resolve("travelerssuitcase");
-            Path dimensionPath = datapackPath
-                    .resolve("data")
-                    .resolve("travelerssuitcase")
-                    .resolve("dimension");
-            Files.createDirectories(dimensionPath);
-            createPackMcmeta(datapackPath);
-            Path dimensionFile = dimensionPath.resolve(dimensionName + ".json");
-            boolean dimensionExists = Files.exists(dimensionFile);
+        if (!world.isClientSide() && hasValidName && !stack.isEnchanted()) {
+            String dimensionName = "pocket_dimension_" + keystoneName.replaceAll("[^a-z0-9_]", "");
+            createOrLoadPersistentDimension(world.getServer(), dimensionName);
             
-            ResourceLocation dimensionKeyLocation = new ResourceLocation("travelerssuitcase", dimensionName);
-            boolean isDimensionRegistered = server.levelKeys().stream()
-                .anyMatch(key -> key.location().equals(dimensionKeyLocation));
+            stack.enchant(Enchantments.BINDING_CURSE, 1);
+            CompoundTag nbt = stack.getOrCreateTag();
+            nbt.putInt("RepairCost", 32767);
             
-            Path dimensionRegistryPath = server.getWorldPath(LevelResource.ROOT)
-                    .resolve("data")
-                    .resolve("travelerssuitcase")
-                    .resolve("dimension_registry");
-            Files.createDirectories(dimensionRegistryPath);
-            Path dimensionRegistryFile = dimensionRegistryPath.resolve("registry.txt");
-            Set<String> registeredDimensionsInFile;
-            if (Files.exists(dimensionRegistryFile)) {
-                registeredDimensionsInFile  = new HashSet<>(Files.readAllLines(dimensionRegistryFile));
-            } else {
-                registeredDimensionsInFile = new HashSet<>();
-            }
-            boolean isDimensionInRegistryFile = registeredDimensionsInFile.contains(dimensionName);
-
-            if (!dimensionExists) {
-                String dimensionJson = """
-                    {
-                        "type": "travelerssuitcase:pocket_dimension_type",
-                        "generator": {
-                            "type": "minecraft:flat",
-                            "settings": {
-                                "biome": "travelerssuitcase:pocket_islands",
-                                "layers": [
-                                    {
-                                        "block": "travelerssuitcase:portal",
-                                        "height": 1
-                                    }
-                                ]
-                            }
-                        }
-                    }
-                    """;
-                Files.writeString(dimensionFile, dimensionJson);
-                if (!isDimensionInRegistryFile) {
-                    registeredDimensionsInFile.add(dimensionName);
-                    Files.write(dimensionRegistryFile, registeredDimensionsInFile);
+            if (entity instanceof Player player) {
+                world.playSound(null, player.getX(), player.getY(), player.getZ(),
+                        SoundEvents.AMETHYST_CLUSTER_FALL, SoundSource.PLAYERS, 2.0F, 2.0F);
             }
         }
 
-            if (!isDimensionInRegistryFile && !isDimensionRegistered) {
-                Path structureMarkerPath = server.getWorldPath(LevelResource.ROOT)
-                        .resolve("data")
-                        .resolve("travelerssuitcase")
-                        .resolve("pending_structures");
-                Files.createDirectories(structureMarkerPath);
-                Files.writeString(structureMarkerPath.resolve(dimensionName + ".txt"), "pending");
-                return true;
-            }
-            return false;
-        } catch (IOException e) {
-            TravelersSuitcase.LOGGER.error("Failed to create dimension: {}", dimensionName, e);
-            return false;
-        }
-    }
-
-    private void createPackMcmeta(@NotNull Path datapackPath) throws IOException {
-        Path packMcmeta = datapackPath.resolve("pack.mcmeta");
-        if (!Files.exists(packMcmeta)) {
-            String content = """
-                    {
-                        "pack": {
-                            "pack_format": 15,
-                            "description": "travelerssuitcase Dimensions"
-                        }
-                    }
-                    """;
-            Files.writeString(packMcmeta, content);
+        if (!world.isClientSide() && stack.hasTag()) {
+            assert stack.getTag() != null;
+            if (stack.getTag().contains("Enchantments")) {
+                CompoundTag nbt = stack.getOrCreateTag();
+                if (nbt.getInt("RepairCost") < 32767) {
+                    nbt.putInt("RepairCost", 32767);
+                }
+            }
         }
     }
 }

src/main/java/io/lampnet/travelerssuitcase/mixin/LevelStemMixin.java

@@ -0,0 +1,34 @@
+package io.lampnet.travelerssuitcase.mixin;
+
+import io.lampnet.travelerssuitcase.world.FantasyDimensionOptions;
+import net.minecraft.world.level.dimension.LevelStem;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Unique;
+
+@Mixin(LevelStem.class)
+public class LevelStemMixin implements FantasyDimensionOptions {
+    @Unique
+    private boolean fantasy$save = true;
+    @Unique
+    private boolean fantasy$saveProperties = true;
+
+    @Override
+    public void fantasy$setSave(boolean value) {
+        this.fantasy$save = value;
+    }
+
+    @Override
+    public boolean fantasy$getSave() {
+        return this.fantasy$save;
+    }
+
+    @Override
+    public void fantasy$setSaveProperties(boolean value) {
+        this.fantasy$saveProperties = value;
+    }
+
+    @Override
+    public boolean fantasy$getSaveProperties() {
+        return this.fantasy$saveProperties;
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/mixin/MappedRegistryMixin.java

@@ -0,0 +1,42 @@
+package io.lampnet.travelerssuitcase.mixin;
+
+import io.lampnet.travelerssuitcase.world.RemoveFromRegistry;
+import net.minecraft.core.MappedRegistry;
+import net.minecraft.resources.ResourceLocation;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.Unique;
+
+@Mixin(MappedRegistry.class)
+public abstract class MappedRegistryMixin<T> implements RemoveFromRegistry<T> {
+    @Shadow
+    private boolean frozen;
+
+    @Unique
+    private boolean fantasy$originalFrozenState = false;
+
+    @Override
+    public boolean fantasy$remove(T value) {
+        // For now, return false as removal is complex
+        return false;
+    }
+
+    @Override
+    public boolean fantasy$remove(ResourceLocation key) {
+        // For now, return false as removal is complex
+        return false;
+    }
+
+    @Override
+    public void fantasy$setFrozen(boolean value) {
+        if (!value && this.frozen) {
+            this.fantasy$originalFrozenState = true;
+        }
+        this.frozen = value;
+    }
+
+    @Override
+    public boolean fantasy$isFrozen() {
+        return this.frozen;
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/mixin/MinecraftServerAccess.java

@@ -0,0 +1,20 @@
+package io.lampnet.travelerssuitcase.mixin;
+
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.storage.LevelStorageSource;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+import java.util.Map;
+
+@Mixin(MinecraftServer.class)
+public interface MinecraftServerAccess {
+    @Accessor("levels")
+    Map<ResourceKey<Level>, ServerLevel> getWorlds();
+
+    @Accessor("storageSource")
+    LevelStorageSource.LevelStorageAccess getSession();
+} 

src/main/java/io/lampnet/travelerssuitcase/mixin/ServerChunkManagerMixin.java

@@ -0,0 +1,31 @@
+package io.lampnet.travelerssuitcase.mixin;
+
+import io.lampnet.travelerssuitcase.world.FantasyWorldAccess;
+import io.lampnet.travelerssuitcase.world.RuntimeWorld;
+import net.minecraft.server.level.ServerChunkCache;
+import net.minecraft.server.level.ServerLevel;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(ServerChunkCache.class)
+public class ServerChunkManagerMixin {
+    @Shadow
+    @Final
+    public ServerLevel level;
+
+    @Inject(method = "runDistanceManagerUpdates", at = @At("HEAD"), cancellable = true)
+    private void onRunDistanceManagerUpdates(CallbackInfoReturnable<Boolean> cir) {
+        if (this.level instanceof RuntimeWorld) {
+            FantasyWorldAccess worldAccess = (FantasyWorldAccess) this.level;
+
+            if (this.level.getChunkSource().getLoadedChunksCount() > 0 || worldAccess.fantasy$shouldTick()) {
+                return;
+            }
+            cir.setReturnValue(false);
+        }
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/mixin/ServerWorldMixin.java

@@ -0,0 +1,54 @@
+package io.lampnet.travelerssuitcase.mixin;
+
+import io.lampnet.travelerssuitcase.world.FantasyWorldAccess;
+import io.lampnet.travelerssuitcase.world.RuntimeWorld;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.server.level.ServerPlayer;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.List;
+import java.util.function.BooleanSupplier;
+
+@Mixin(ServerLevel.class)
+public abstract class ServerWorldMixin implements FantasyWorldAccess {
+    @Unique
+    private boolean fantasy$tickWhenEmpty = false;
+
+    @Inject(method = "tick", at = @At("HEAD"), cancellable = true)
+    private void onTick(BooleanSupplier shouldKeepTicking, CallbackInfo ci) {
+        if ((Object) this instanceof RuntimeWorld) {
+            if (!this.fantasy$shouldTick()) {
+                ci.cancel();
+            }
+        }
+    }
+
+    @Shadow
+    public abstract List<ServerPlayer> players();
+
+    @Shadow
+    public abstract net.minecraft.server.level.ServerChunkCache getChunkSource();
+
+    @Override
+    public void fantasy$setTickWhenEmpty(boolean tickWhenEmpty) {
+        this.fantasy$tickWhenEmpty = tickWhenEmpty;
+    }
+
+    @Override
+    public boolean fantasy$shouldTick() {
+        if ((Object) this instanceof RuntimeWorld) {
+            return this.fantasy$tickWhenEmpty || !this.travelerssuitcase$isWorldEmpty();
+        }
+        return true;
+    }
+
+    @Unique
+    private boolean travelerssuitcase$isWorldEmpty() {
+        return this.players().isEmpty() && this.getChunkSource().getLoadedChunksCount() <= 0;
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/util/GameRuleStore.java

@@ -0,0 +1,33 @@
+package io.lampnet.travelerssuitcase.util;
+
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.world.level.GameRules;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public final class GameRuleStore {
+    private final Map<GameRules.Key<GameRules.BooleanValue>, Boolean> booleanRules = new HashMap<>();
+    private final Map<GameRules.Key<GameRules.IntegerValue>, Integer> intRules = new HashMap<>();
+
+    public void set(GameRules.Key<GameRules.BooleanValue> key, boolean value) {
+        this.booleanRules.put(key, value);
+    }
+
+    public void set(GameRules.Key<GameRules.IntegerValue> key, int value) {
+        this.intRules.put(key, value);
+    }
+
+    public void applyTo(GameRules rules, @Nullable MinecraftServer server) {
+        for (Map.Entry<GameRules.Key<GameRules.BooleanValue>, Boolean> entry : this.booleanRules.entrySet()) {
+            GameRules.BooleanValue rule = rules.getRule(entry.getKey());
+            rule.set(entry.getValue(), server);
+        }
+
+        for (Map.Entry<GameRules.Key<GameRules.IntegerValue>, Integer> entry : this.intRules.entrySet()) {
+            GameRules.IntegerValue rule = rules.getRule(entry.getKey());
+            rule.set(entry.getValue(), server);
+        }
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/util/VoidWorldProgressListener.java

@@ -0,0 +1,33 @@
+package io.lampnet.travelerssuitcase.util;
+
+import net.minecraft.server.level.progress.ChunkProgressListener;
+import net.minecraft.world.level.ChunkPos;
+import net.minecraft.world.level.chunk.ChunkStatus;
+import org.jetbrains.annotations.Nullable;
+
+public class VoidWorldProgressListener implements ChunkProgressListener {
+    public static final VoidWorldProgressListener INSTANCE = new VoidWorldProgressListener();
+
+    private VoidWorldProgressListener() {
+    }
+
+    @Override
+    public void updateSpawnPos(ChunkPos spawnPos) {
+        // Do nothing
+    }
+
+    @Override
+    public void onStatusChange(ChunkPos pos, @Nullable ChunkStatus status) {
+        // Do nothing
+    }
+
+    @Override
+    public void start() {
+        // Do nothing
+    }
+
+    @Override
+    public void stop() {
+        // Do nothing
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/world/Fantasy.java

@@ -0,0 +1,197 @@
+package io.lampnet.travelerssuitcase.world;
+
+import com.google.common.base.Preconditions;
+import it.unimi.dsi.fastutil.objects.ReferenceOpenHashSet;
+import io.lampnet.travelerssuitcase.mixin.MinecraftServerAccess;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.dimension.LevelStem;
+import net.minecraft.world.level.storage.LevelStorageSource;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.event.TickEvent;
+import net.minecraftforge.event.server.ServerStoppingEvent;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.lang3.RandomStringUtils;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+
+public final class Fantasy {
+    public static final Logger LOGGER = LogManager.getLogger(Fantasy.class);
+    public static final String ID = "fantasy";
+    public static final ResourceKey<LevelStem> DEFAULT_DIM_TYPE = ResourceKey.create(Registries.LEVEL_STEM, ResourceLocation.fromNamespaceAndPath(Fantasy.ID, "default"));
+
+    private static Fantasy instance;
+
+    private final MinecraftServer server;
+    private final MinecraftServerAccess serverAccess;
+
+    private final RuntimeWorldManager worldManager;
+
+    private final Set<ServerLevel> deletionQueue = new ReferenceOpenHashSet<>();
+    private final Set<ServerLevel> unloadingQueue = new ReferenceOpenHashSet<>();
+
+    static {
+        MinecraftForge.EVENT_BUS.register(Fantasy.class);
+    }
+
+    private Fantasy(MinecraftServer server) {
+        this.server = server;
+        this.serverAccess = (MinecraftServerAccess) server;
+        this.worldManager = new RuntimeWorldManager(server);
+    }
+
+    public static Fantasy get(MinecraftServer server) {
+        Preconditions.checkState(server.isSameThread(), "cannot create worlds from off-thread!");
+
+        if (instance == null || instance.server != server) {
+            instance = new Fantasy(server);
+        }
+
+        return instance;
+    }
+
+    @SubscribeEvent
+    public static void onServerTick(TickEvent.ServerTickEvent event) {
+        if (event.phase == TickEvent.Phase.START && instance != null) {
+            instance.tick();
+        }
+    }
+
+    @SubscribeEvent
+    public static void onServerStopping(ServerStoppingEvent event) {
+        if(instance != null) {
+            instance.onServerStopping();
+        }
+    }
+
+    private void tick() {
+        Set<ServerLevel> deletionQueue = this.deletionQueue;
+        if (!deletionQueue.isEmpty()) {
+            deletionQueue.removeIf(this::tickDeleteWorld);
+        }
+
+        Set<ServerLevel> unloadingQueue = this.unloadingQueue;
+        if (!unloadingQueue.isEmpty()) {
+            unloadingQueue.removeIf(this::tickUnloadWorld);
+        }
+    }
+
+    public RuntimeWorldHandle openTemporaryWorld(RuntimeWorldConfig config) {
+        RuntimeWorld world = this.addTemporaryWorld(config);
+        return new RuntimeWorldHandle(this, world);
+    }
+
+    public RuntimeWorldHandle getOrOpenPersistentWorld(ResourceLocation key, RuntimeWorldConfig config) {
+        ResourceKey<Level> worldKey = ResourceKey.create(Registries.DIMENSION, key);
+
+        ServerLevel world = this.server.getLevel(worldKey);
+        if (world == null) {
+            world = this.addPersistentWorld(key, config);
+        } else {
+            this.deletionQueue.remove(world);
+        }
+
+        return new RuntimeWorldHandle(this, world);
+    }
+
+    private RuntimeWorld addPersistentWorld(ResourceLocation key, RuntimeWorldConfig config) {
+        ResourceKey<Level> worldKey = ResourceKey.create(Registries.DIMENSION, key);
+        return this.worldManager.add(worldKey, config, RuntimeWorld.Style.PERSISTENT);
+    }
+
+    private RuntimeWorld addTemporaryWorld(RuntimeWorldConfig config) {
+        ResourceKey<Level> worldKey = ResourceKey.create(Registries.DIMENSION, generateTemporaryWorldKey());
+
+        try {
+            LevelStorageSource.LevelStorageAccess session = this.serverAccess.getSession();
+            FileUtils.forceDeleteOnExit(session.getDimensionPath(worldKey).toFile());
+        } catch (IOException ignored) {
+        }
+
+        return this.worldManager.add(worldKey, config, RuntimeWorld.Style.TEMPORARY);
+    }
+
+    void enqueueWorldDeletion(ServerLevel world) {
+        this.server.execute(() -> this.deletionQueue.add(world));
+    }
+
+    void enqueueWorldUnloading(ServerLevel world) {
+        this.server.execute(() -> this.unloadingQueue.add(world));
+    }
+
+    private boolean tickDeleteWorld(ServerLevel world) {
+        if (this.isWorldUnloaded(world)) {
+            this.worldManager.delete(world);
+            return true;
+        } else {
+            this.kickPlayers(world);
+            return false;
+        }
+    }
+
+    private boolean tickUnloadWorld(ServerLevel world) {
+        if (this.isWorldUnloaded(world)) {
+            this.worldManager.unload(world);
+            return true;
+        } else {
+            this.kickPlayers(world);
+            return false;
+        }
+    }
+
+    private void kickPlayers(ServerLevel world) {
+        if (world.players().isEmpty()) {
+            return;
+        }
+
+        ServerLevel overworld = this.server.overworld();
+        BlockPos spawnPos = overworld.getSharedSpawnPos();
+        float spawnAngle = overworld.getSharedSpawnAngle();
+
+        List<ServerPlayer> players = new ArrayList<>(world.players());
+        for (ServerPlayer player : players) {
+            player.teleportTo(overworld, spawnPos.getX() + 0.5, spawnPos.getY(), spawnPos.getZ() + 0.5, spawnAngle, 0.0F);
+        }
+    }
+
+    private boolean isWorldUnloaded(ServerLevel world) {
+        return world.players().isEmpty() && world.getChunkSource().getLoadedChunksCount() <= 0;
+    }
+
+    private void onServerStopping() {
+        List<RuntimeWorld> temporaryWorlds = this.collectTemporaryWorlds();
+        for (RuntimeWorld temporary : temporaryWorlds) {
+            this.kickPlayers(temporary);
+            this.worldManager.delete(temporary);
+        }
+    }
+
+    private List<RuntimeWorld> collectTemporaryWorlds() {
+        List<RuntimeWorld> temporaryWorlds = new ArrayList<>();
+        for (ServerLevel world : this.server.getAllLevels()) {
+            if (world instanceof RuntimeWorld runtimeWorld) {
+                if (runtimeWorld.style == RuntimeWorld.Style.TEMPORARY) {
+                    temporaryWorlds.add(runtimeWorld);
+                }
+            }
+        }
+        return temporaryWorlds;
+    }
+
+    private static ResourceLocation generateTemporaryWorldKey() {
+        String key = RandomStringUtils.random(16, "abcdefghijklmnopqrstuvwxyz0123456789");
+        return ResourceLocation.fromNamespaceAndPath(Fantasy.ID, key);
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/world/FantasyDimensionOptions.java

@@ -0,0 +1,17 @@
+package io.lampnet.travelerssuitcase.world;
+
+import net.minecraft.world.level.dimension.LevelStem;
+import org.jetbrains.annotations.ApiStatus;
+
+import java.util.function.Predicate;
+
+@ApiStatus.Internal
+public interface FantasyDimensionOptions {
+    Predicate<LevelStem> SAVE_PREDICATE = (e) -> ((FantasyDimensionOptions) (Object) e).fantasy$getSave();
+    Predicate<LevelStem> SAVE_PROPERTIES_PREDICATE = (e) -> ((FantasyDimensionOptions) (Object) e).fantasy$getSaveProperties();
+
+    void fantasy$setSave(boolean value);
+    boolean fantasy$getSave();
+    void fantasy$setSaveProperties(boolean value);
+    boolean fantasy$getSaveProperties();
+} 

src/main/java/io/lampnet/travelerssuitcase/world/FantasyInitializer.java

@@ -0,0 +1,25 @@
+package io.lampnet.travelerssuitcase.world;
+
+import com.mojang.serialization.Codec;
+import io.lampnet.travelerssuitcase.TravelersSuitcase;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.world.level.chunk.ChunkGenerator;
+import net.minecraftforge.eventbus.api.IEventBus;
+import net.minecraftforge.registries.DeferredRegister;
+import net.minecraftforge.registries.RegistryObject;
+
+public final class FantasyInitializer {
+    public static final DeferredRegister<Codec<? extends ChunkGenerator>> CHUNK_GENERATORS =
+            DeferredRegister.create(Registries.CHUNK_GENERATOR, TravelersSuitcase.MODID);
+
+    public static final RegistryObject<Codec<PortalChunkGenerator>> PORTAL_GENERATOR = 
+            CHUNK_GENERATORS.register("portal", () -> PortalChunkGenerator.CODEC);
+
+    public static void register(IEventBus eventBus) {
+        CHUNK_GENERATORS.register(eventBus);
+    }
+
+    public void onInitialize() {
+        // Registration now handled by DeferredRegister
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/world/FantasyWorldAccess.java

@@ -0,0 +1,10 @@
+package io.lampnet.travelerssuitcase.world;
+
+import org.jetbrains.annotations.ApiStatus;
+
+@ApiStatus.Internal
+public interface FantasyWorldAccess {
+    void fantasy$setTickWhenEmpty(boolean tickWhenEmpty);
+
+    boolean fantasy$shouldTick();
+} 

src/main/java/io/lampnet/travelerssuitcase/world/PortalChunkGenerator.java

@@ -0,0 +1,104 @@
+package io.lampnet.travelerssuitcase.world;
+
+import com.mojang.serialization.Codec;
+import com.mojang.serialization.codecs.RecordCodecBuilder;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Registry;
+import net.minecraft.server.level.WorldGenRegion;
+import net.minecraft.world.level.LevelHeightAccessor;
+import net.minecraft.world.level.NoiseColumn;
+import net.minecraft.world.level.StructureManager;
+import net.minecraft.world.level.biome.Biome;
+import net.minecraft.world.level.biome.BiomeManager;
+import net.minecraft.world.level.biome.BiomeSource;
+import net.minecraft.world.level.biome.FixedBiomeSource;
+import net.minecraft.world.level.block.Blocks;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.chunk.ChunkAccess;
+import net.minecraft.world.level.chunk.ChunkGenerator;
+import net.minecraft.world.level.levelgen.GenerationStep;
+import net.minecraft.world.level.levelgen.Heightmap;
+import net.minecraft.world.level.levelgen.RandomState;
+import net.minecraft.world.level.levelgen.blending.Blender;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+
+import java.util.Arrays;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Executor;
+
+public class PortalChunkGenerator extends ChunkGenerator {
+    public static final Codec<PortalChunkGenerator> CODEC = RecordCodecBuilder.create(instance -> 
+        instance.group(
+            BiomeSource.CODEC.fieldOf("biome_source").forGetter(ChunkGenerator::getBiomeSource)
+        ).apply(instance, PortalChunkGenerator::new)
+    );
+
+    public PortalChunkGenerator(BiomeSource biomeSource) {
+        super(biomeSource);
+    }
+
+    public PortalChunkGenerator(Registry<Biome> biomeRegistry) {
+        super(new FixedBiomeSource(biomeRegistry.getHolderOrThrow(
+            ResourceKey.create(Registries.BIOME, ResourceLocation.fromNamespaceAndPath("travelerssuitcase", "pocket_islands"))
+        )));
+    }
+
+    @Override
+    protected Codec<? extends ChunkGenerator> codec() {
+        return CODEC;
+    }
+
+    @Override
+    public void applyCarvers(WorldGenRegion level, long seed, RandomState randomState, BiomeManager biomeManager, StructureManager structureManager, ChunkAccess chunk, GenerationStep.Carving step) {
+        // Empty implementation - no carvers needed
+    }
+
+    @Override
+    public void buildSurface(WorldGenRegion level, StructureManager structureManager, RandomState randomState, ChunkAccess chunk) {
+        // Empty implementation - no surface building needed
+    }
+
+    @Override
+    public void spawnOriginalMobs(WorldGenRegion level) {
+        // Empty implementation - no mobs
+    }
+
+    @Override
+    public int getGenDepth() {
+        return 384;
+    }
+
+    @Override
+    public CompletableFuture<ChunkAccess> fillFromNoise(Executor executor, Blender blender, RandomState randomState, StructureManager structureManager, ChunkAccess chunk) {
+        return CompletableFuture.completedFuture(chunk);
+    }
+
+    @Override
+    public int getSeaLevel() {
+        return 63;
+    }
+
+    @Override
+    public int getMinY() {
+        return -64;
+    }
+
+    @Override
+    public int getBaseHeight(int x, int z, Heightmap.Types type, LevelHeightAccessor level, RandomState randomState) {
+        return 0;
+    }
+
+    @Override
+    public NoiseColumn getBaseColumn(int x, int z, LevelHeightAccessor level, RandomState randomState) {
+        BlockState[] column = new BlockState[level.getHeight()];
+        Arrays.fill(column, Blocks.AIR.defaultBlockState());
+        return new NoiseColumn(level.getMinBuildHeight(), column);
+    }
+
+    @Override
+    public void addDebugScreenInfo(java.util.List<String> info, RandomState randomState, BlockPos pos) {
+        // Empty implementation
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/world/RemoveFromRegistry.java

@@ -0,0 +1,26 @@
+package io.lampnet.travelerssuitcase.world;
+
+import net.minecraft.core.MappedRegistry;
+import net.minecraft.resources.ResourceLocation;
+import org.jetbrains.annotations.ApiStatus;
+
+@ApiStatus.Internal
+public interface RemoveFromRegistry<T> {
+    @SuppressWarnings("unchecked")
+    static <T> boolean remove(MappedRegistry<T> registry, ResourceLocation key) {
+        return ((RemoveFromRegistry<T>) registry).fantasy$remove(key);
+    }
+
+    @SuppressWarnings("unchecked")
+    static <T> boolean remove(MappedRegistry<T> registry, T value) {
+        return ((RemoveFromRegistry<T>) registry).fantasy$remove(value);
+    }
+
+    boolean fantasy$remove(T value);
+
+    boolean fantasy$remove(ResourceLocation key);
+
+    void fantasy$setFrozen(boolean value);
+
+    boolean fantasy$isFrozen();
+} 

src/main/java/io/lampnet/travelerssuitcase/world/RuntimeWorld.java

@@ -0,0 +1,68 @@
+package io.lampnet.travelerssuitcase.world;
+
+import com.google.common.collect.ImmutableList;
+import io.lampnet.travelerssuitcase.mixin.MinecraftServerAccess;
+import io.lampnet.travelerssuitcase.util.VoidWorldProgressListener;
+import net.minecraft.Util;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.util.ProgressListener;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.biome.BiomeManager;
+import net.minecraft.world.level.dimension.LevelStem;
+import org.jetbrains.annotations.Nullable;
+
+public class RuntimeWorld extends ServerLevel {
+    final Style style;
+    private boolean flat;
+
+    protected RuntimeWorld(MinecraftServer server, ResourceKey<Level> registryKey, RuntimeWorldConfig config, Style style) {
+        super(
+                server,
+                Util.backgroundExecutor(),
+                ((MinecraftServerAccess) server).getSession(),
+                new RuntimeWorldProperties(server.getWorldData().overworldData(), config, server),
+                registryKey,
+                new LevelStem(
+                        server.registryAccess().registryOrThrow(net.minecraft.core.registries.Registries.DIMENSION_TYPE)
+                                .getHolderOrThrow(net.minecraft.world.level.dimension.BuiltinDimensionTypes.OVERWORLD),
+                        config.getGenerator()
+                ),
+                VoidWorldProgressListener.INSTANCE,
+                false,
+                BiomeManager.obfuscateSeed(config.getSeed()),
+                ImmutableList.of(),
+                config.shouldTickTime(),
+                null
+        );
+        this.style = style;
+        this.flat = config.isFlat().equals(RuntimeWorldConfig.TriState.TRUE);
+    }
+
+    @Override
+    public long getSeed() {
+        return super.getSeed();
+    }
+
+    @Override
+    public void save(@Nullable ProgressListener progressListener, boolean flush, boolean enabled) {
+        if (this.style == Style.PERSISTENT || !flush) {
+            super.save(progressListener, flush, enabled);
+        }
+    }
+
+    @Override
+    public boolean isFlat() {
+        return this.flat;
+    }
+
+    public enum Style {
+        PERSISTENT,
+        TEMPORARY
+    }
+
+    public interface Constructor {
+        RuntimeWorld createWorld(MinecraftServer server, ResourceKey<Level> registryKey, RuntimeWorldConfig config, Style style);
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/world/RuntimeWorldConfig.java

@@ -0,0 +1,199 @@
+package io.lampnet.travelerssuitcase.world;
+
+import com.google.common.base.Preconditions;
+import io.lampnet.travelerssuitcase.Config;
+import io.lampnet.travelerssuitcase.util.GameRuleStore;
+import net.minecraft.core.Holder;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.world.Difficulty;
+import net.minecraft.world.level.GameRules;
+import net.minecraft.world.level.dimension.LevelStem;
+import net.minecraft.world.level.chunk.ChunkGenerator;
+import org.jetbrains.annotations.Nullable;
+
+public final class RuntimeWorldConfig {
+    private long seed = 0;
+    private ResourceKey<LevelStem> dimensionTypeKey = Fantasy.DEFAULT_DIM_TYPE;
+    private Holder<LevelStem> dimensionType;
+    private ChunkGenerator generator = null;
+    private boolean shouldTickTime = Config.shouldTickTime();
+    private long timeOfDay = Config.getDefaultTimeOfDay();
+    private Difficulty difficulty = null; // Will use server difficulty
+    private final GameRuleStore gameRules = new GameRuleStore();
+    private RuntimeWorld.Constructor worldConstructor = RuntimeWorld::new;
+
+    private int sunnyTime = Config.getDefaultSunnyTime();
+    private boolean raining = Config.isDefaultRaining();
+    private int rainTime = Config.getDefaultRainTime();
+    private boolean thundering = Config.isDefaultThundering();
+    private int thunderTime = Config.getDefaultThunderTime();
+    private TriState flat = TriState.DEFAULT;
+
+    public enum TriState {
+        DEFAULT,
+        TRUE,
+        FALSE;
+
+        public static TriState of(boolean value) {
+            return value ? TRUE : FALSE;
+        }
+    }
+
+    public RuntimeWorldConfig setSeed(long seed) {
+        this.seed = seed;
+        return this;
+    }
+
+    public RuntimeWorldConfig setWorldConstructor(RuntimeWorld.Constructor constructor) {
+        this.worldConstructor = constructor;
+        return this;
+    }
+
+    public RuntimeWorldConfig setDimensionType(Holder<LevelStem> dimensionType) {
+        this.dimensionType = dimensionType;
+        this.dimensionTypeKey = null;
+        return this;
+    }
+
+    public RuntimeWorldConfig setDimensionType(ResourceKey<LevelStem> dimensionTypeKey) {
+        this.dimensionTypeKey = dimensionTypeKey;
+        this.dimensionType = null;
+        return this;
+    }
+
+    public RuntimeWorldConfig setGenerator(ChunkGenerator generator) {
+        this.generator = generator;
+        return this;
+    }
+
+    public RuntimeWorldConfig setShouldTickTime(boolean shouldTickTime) {
+        this.shouldTickTime = shouldTickTime;
+        return this;
+    }
+
+    public RuntimeWorldConfig setTimeOfDay(long timeOfDay) {
+        this.timeOfDay = timeOfDay;
+        return this;
+    }
+
+    public RuntimeWorldConfig setDifficulty(Difficulty difficulty) {
+        this.difficulty = difficulty;
+        return this;
+    }
+
+    public RuntimeWorldConfig setGameRule(GameRules.Key<GameRules.BooleanValue> key, boolean value) {
+        this.gameRules.set(key, value);
+        return this;
+    }
+
+    public RuntimeWorldConfig setGameRule(GameRules.Key<GameRules.IntegerValue> key, int value) {
+        this.gameRules.set(key, value);
+        return this;
+    }
+
+    public RuntimeWorldConfig setSunnyTime(int sunnyTime) {
+        this.sunnyTime = sunnyTime;
+        return this;
+    }
+
+    public RuntimeWorldConfig setRaining(int rainTime) {
+        this.raining = rainTime > 0;
+        this.rainTime = rainTime;
+        return this;
+    }
+
+    public RuntimeWorldConfig setRaining(boolean raining) {
+        this.raining = raining;
+        return this;
+    }
+
+    public RuntimeWorldConfig setThundering(int thunderTime) {
+        this.thundering = thunderTime > 0;
+        this.thunderTime = thunderTime;
+        return this;
+    }
+
+    public RuntimeWorldConfig setThundering(boolean thundering) {
+        this.thundering = thundering;
+        return this;
+    }
+
+    public RuntimeWorldConfig setFlat(TriState state) {
+        this.flat = state;
+        return this;
+    }
+
+    public RuntimeWorldConfig setFlat(boolean state) {
+        return this.setFlat(TriState.of(state));
+    }
+
+    public long getSeed() {
+        return this.seed;
+    }
+
+    public LevelStem createDimensionOptions(MinecraftServer server) {
+        var dimensionTypeHolder = server.registryAccess().registryOrThrow(net.minecraft.core.registries.Registries.DIMENSION_TYPE)
+                .getHolderOrThrow(net.minecraft.world.level.dimension.BuiltinDimensionTypes.OVERWORLD);
+        return new LevelStem(dimensionTypeHolder, this.generator);
+    }
+
+    private Holder<LevelStem> resolveDimensionType(MinecraftServer server) {
+        var dimensionType = this.dimensionType;
+        if (dimensionType == null) {
+            dimensionType = server.registryAccess().registryOrThrow(Registries.LEVEL_STEM).getHolder(this.dimensionTypeKey).orElse(null);
+            Preconditions.checkNotNull(dimensionType, "invalid dimension type " + this.dimensionTypeKey);
+        }
+        return dimensionType;
+    }
+
+    @Nullable
+    public ChunkGenerator getGenerator() {
+        return this.generator;
+    }
+
+    public RuntimeWorld.Constructor getWorldConstructor() {
+        return this.worldConstructor;
+    }
+
+    public boolean shouldTickTime() {
+        return this.shouldTickTime;
+    }
+
+    public long getTimeOfDay() {
+        return this.timeOfDay;
+    }
+
+    public Difficulty getDifficulty(MinecraftServer server) {
+        return this.difficulty != null ? this.difficulty : server.getWorldData().getDifficulty();
+    }
+
+    public GameRuleStore getGameRules() {
+        return this.gameRules;
+    }
+
+    public int getSunnyTime() {
+        return this.sunnyTime;
+    }
+
+    public int getRainTime() {
+        return this.rainTime;
+    }
+
+    public int getThunderTime() {
+        return this.thunderTime;
+    }
+
+    public boolean isRaining() {
+        return this.raining;
+    }
+
+    public boolean isThundering() {
+        return this.thundering;
+    }
+
+    public TriState isFlat() {
+        return this.flat;
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/world/RuntimeWorldHandle.java

@@ -0,0 +1,37 @@
+package io.lampnet.travelerssuitcase.world;
+
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.level.Level;
+
+public final class RuntimeWorldHandle {
+    private final Fantasy fantasy;
+    private final ServerLevel world;
+
+    RuntimeWorldHandle(Fantasy fantasy, ServerLevel world) {
+        this.fantasy = fantasy;
+        this.world = world;
+    }
+
+    public void setTickWhenEmpty(boolean tickWhenEmpty) {
+        ((FantasyWorldAccess) this.world).fantasy$setTickWhenEmpty(tickWhenEmpty);
+    }
+
+    public void delete() {
+        if (this.world instanceof RuntimeWorld runtimeWorld) {
+            if (runtimeWorld.style == RuntimeWorld.Style.PERSISTENT) {
+                this.fantasy.enqueueWorldDeletion(this.world);
+            } else {
+                this.fantasy.enqueueWorldUnloading(this.world);
+            }
+        }
+    }
+
+    public ServerLevel asWorld() {
+        return this.world;
+    }
+
+    public ResourceKey<Level> getRegistryKey() {
+        return this.world.dimension();
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/world/RuntimeWorldManager.java

@@ -0,0 +1,115 @@
+package io.lampnet.travelerssuitcase.world;
+
+import com.mojang.serialization.Lifecycle;
+import io.lampnet.travelerssuitcase.mixin.MinecraftServerAccess;
+import net.minecraft.core.MappedRegistry;
+import net.minecraft.core.Registry;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.network.chat.Component;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.util.ProgressListener;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.dimension.LevelStem;
+import net.minecraft.world.level.storage.LevelStorageSource;
+import org.apache.commons.io.FileUtils;
+
+import java.io.File;
+import java.io.IOException;
+
+final class RuntimeWorldManager {
+    private final MinecraftServer server;
+    private final MinecraftServerAccess serverAccess;
+
+    RuntimeWorldManager(MinecraftServer server) {
+        this.server = server;
+        this.serverAccess = (MinecraftServerAccess) server;
+    }
+
+    RuntimeWorld add(ResourceKey<Level> worldKey, RuntimeWorldConfig config, RuntimeWorld.Style style) {
+        LevelStem options = config.createDimensionOptions(this.server);
+
+        if (style == RuntimeWorld.Style.TEMPORARY) {
+            ((FantasyDimensionOptions) (Object) options).fantasy$setSave(false);
+        }
+        ((FantasyDimensionOptions) (Object) options).fantasy$setSaveProperties(false);
+
+        MappedRegistry<LevelStem> dimensionsRegistry = getDimensionsRegistry(this.server);
+        boolean isFrozen = ((RemoveFromRegistry<?>) dimensionsRegistry).fantasy$isFrozen();
+        ((RemoveFromRegistry<?>) dimensionsRegistry).fantasy$setFrozen(false);
+
+        var key = ResourceKey.create(net.minecraft.core.registries.Registries.LEVEL_STEM, worldKey.location());
+        if(!dimensionsRegistry.containsKey(key)) {
+            dimensionsRegistry.register(key, options, Lifecycle.stable());
+        }
+        ((RemoveFromRegistry<?>) dimensionsRegistry).fantasy$setFrozen(isFrozen);
+
+        RuntimeWorld world = config.getWorldConstructor().createWorld(this.server, worldKey, config, style);
+
+        this.serverAccess.getWorlds().put(world.dimension(), world);
+
+        net.minecraftforge.common.MinecraftForge.EVENT_BUS.post(new net.minecraftforge.event.level.LevelEvent.Load(world));
+        world.tick(() -> true);
+
+        return world;
+    }
+
+    void delete(ServerLevel world) {
+        ResourceKey<Level> dimensionKey = world.dimension();
+
+        if (this.serverAccess.getWorlds().remove(dimensionKey, world)) {
+            net.minecraftforge.common.MinecraftForge.EVENT_BUS.post(new net.minecraftforge.event.level.LevelEvent.Unload(world));
+
+            MappedRegistry<LevelStem> dimensionsRegistry = getDimensionsRegistry(this.server);
+            RemoveFromRegistry.remove(dimensionsRegistry, dimensionKey.location());
+
+            LevelStorageSource.LevelStorageAccess session = this.serverAccess.getSession();
+            File worldDirectory = session.getDimensionPath(dimensionKey).toFile();
+            if (worldDirectory.exists()) {
+                try {
+                    FileUtils.deleteDirectory(worldDirectory);
+                } catch (IOException e) {
+                    Fantasy.LOGGER.warn("Failed to delete world directory", e);
+                    try {
+                        FileUtils.forceDeleteOnExit(worldDirectory);
+                    } catch (IOException ignored) {
+                    }
+                }
+            }
+        }
+    }
+
+    void unload(ServerLevel world) {
+        ResourceKey<Level> dimensionKey = world.dimension();
+
+        if (this.serverAccess.getWorlds().remove(dimensionKey, world)) {
+            world.save(new ProgressListener() {
+                @Override
+                public void progressStartNoAbort(Component component) {}
+
+                @Override
+                public void progressStart(Component component) {}
+
+                @Override
+                public void progressStage(Component component) {}
+
+                @Override
+                public void progressStagePercentage(int i) {}
+
+                @Override
+                public void stop() {
+                    net.minecraftforge.common.MinecraftForge.EVENT_BUS.post(new net.minecraftforge.event.level.LevelEvent.Unload(world));
+
+                    MappedRegistry<LevelStem> dimensionsRegistry = getDimensionsRegistry(RuntimeWorldManager.this.server);
+                    RemoveFromRegistry.remove(dimensionsRegistry, dimensionKey.location());
+                }
+            }, true, false);
+        }
+    }
+
+    private static MappedRegistry<LevelStem> getDimensionsRegistry(MinecraftServer server) {
+        Registry<LevelStem> registry = server.registryAccess().registryOrThrow(Registries.LEVEL_STEM);
+        return (MappedRegistry<LevelStem>) registry;
+    }
+} 

src/main/java/io/lampnet/travelerssuitcase/world/RuntimeWorldProperties.java

@@ -0,0 +1,224 @@
+package io.lampnet.travelerssuitcase.world;
+
+import net.minecraft.CrashReportCategory;
+
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.world.Difficulty;
+import net.minecraft.world.level.GameRules;
+import net.minecraft.world.level.GameType;
+import net.minecraft.world.level.border.WorldBorder;
+import net.minecraft.world.level.storage.ServerLevelData;
+import net.minecraft.world.level.timers.TimerQueue;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.UUID;
+
+public class RuntimeWorldProperties implements ServerLevelData {
+    private final ServerLevelData parent;
+    final RuntimeWorldConfig config;
+    private final MinecraftServer server;
+
+    public RuntimeWorldProperties(ServerLevelData parent, RuntimeWorldConfig config, MinecraftServer server) {
+        this.parent = parent;
+        this.config = config;
+        this.server = server;
+    }
+
+    @Override
+    public @NotNull String getLevelName() {
+        return "Runtime Pocket Dimension";
+    }
+
+    @Override
+    public void setThundering(boolean thundering) {
+        this.config.setThundering(thundering);
+    }
+
+    @Override
+    public int getRainTime() {
+        return this.config.getRainTime();
+    }
+
+    @Override
+    public void setRainTime(int rainTime) {
+        this.config.setRaining(rainTime);
+    }
+
+    @Override
+    public int getThunderTime() {
+        return this.config.getThunderTime();
+    }
+
+    @Override
+    public void setThunderTime(int thunderTime) {
+        this.config.setThundering(thunderTime);
+    }
+
+    @Override
+    public boolean isThundering() {
+        return this.config.isThundering();
+    }
+
+    @Override
+    public boolean isRaining() {
+        return this.config.isRaining();
+    }
+
+    @Override
+    public void setRaining(boolean raining) {
+        this.config.setRaining(raining);
+    }
+
+    @Override
+    public int getClearWeatherTime() {
+        return this.config.getSunnyTime();
+    }
+
+    @Override
+    public void setClearWeatherTime(int time) {
+        this.config.setSunnyTime(time);
+    }
+
+    @Override
+    public int getWanderingTraderSpawnDelay() {
+        return parent.getWanderingTraderSpawnDelay();
+    }
+
+    @Override
+    public void setWanderingTraderSpawnDelay(int delay) {
+        parent.setWanderingTraderSpawnDelay(delay);
+    }
+
+    @Override
+    public int getWanderingTraderSpawnChance() {
+        return parent.getWanderingTraderSpawnChance();
+    }
+
+    @Override
+    public void setWanderingTraderSpawnChance(int chance) {
+        parent.setWanderingTraderSpawnChance(chance);
+    }
+
+    @Override
+    public UUID getWanderingTraderId() {
+        return parent.getWanderingTraderId();
+    }
+
+    @Override
+    public void setWanderingTraderId(UUID id) {
+        parent.setWanderingTraderId(id);
+    }
+
+    @Override
+    public @NotNull GameType getGameType() {
+        return parent.getGameType();
+    }
+
+    @Override
+    public void setGameType(@NotNull GameType type) {}
+
+    @Override
+    public boolean isHardcore() {
+        return parent.isHardcore();
+    }
+
+    @Override
+    public boolean getAllowCommands() {
+        return parent.getAllowCommands();
+    }
+
+    @Override
+    public boolean isInitialized() {
+        return true;
+    }
+
+    @Override
+    public void setInitialized(boolean initialized) {}
+
+    @Override
+    public @NotNull GameRules getGameRules() {
+        GameRules rules = new GameRules();
+        this.config.getGameRules().applyTo(rules, null);
+        return rules;
+    }
+
+    @Override
+    public @NotNull WorldBorder.Settings getWorldBorder() {
+        return parent.getWorldBorder();
+    }
+
+    @Override
+    public void setWorldBorder(@NotNull WorldBorder.Settings settings) {}
+
+    @Override
+    public @NotNull Difficulty getDifficulty() {
+        return this.config.getDifficulty(this.server);
+    }
+
+    @Override
+    public boolean isDifficultyLocked() {
+        return parent.isDifficultyLocked();
+    }
+
+    @Override
+    public @NotNull TimerQueue<MinecraftServer> getScheduledEvents() {
+        return new TimerQueue<>(null);
+    }
+
+    @Override
+    public int getXSpawn() {
+        return 0;
+    }
+
+    @Override
+    public int getYSpawn() {
+        return 64;
+    }
+
+    @Override
+    public int getZSpawn() {
+        return 0;
+    }
+
+    @Override
+    public float getSpawnAngle() {
+        return 0;
+    }
+
+    @Override
+    public void setXSpawn(int x) {}
+
+    @Override
+    public void setYSpawn(int y) {}
+
+    @Override
+    public void setZSpawn(int z) {}
+
+    @Override
+    public void setSpawnAngle(float angle) {}
+
+    @Override
+    public long getGameTime() {
+        return parent.getGameTime();
+    }
+
+    @Override
+    public long getDayTime() {
+        return config.getTimeOfDay();
+    }
+
+    @Override
+    public void setGameTime(long time) {}
+
+    @Override
+    public void setDayTime(long time) {
+        if (config.shouldTickTime()) {
+            config.setTimeOfDay(time);
+        }
+    }
+
+    @Override
+    public void fillCrashReportCategory(@NotNull CrashReportCategory category, net.minecraft.world.level.LevelHeightAccessor context) {
+        parent.fillCrashReportCategory(category, context);
+    }
+} 

src/main/resources/data/travelerssuitcase/advancements/smaller_on_the_outside.json

@@ -0,0 +1,28 @@
+{
+    "parent": "minecraft:adventure/root",
+    "display": {
+        "icon": {
+            "item": "travelerssuitcase:keystone"
+        },
+        "title": {
+            "text": "Smaller on the Outside"
+        },
+        "description": {
+            "text": "Enter a pocket dimension."
+        },
+        "frame": "task",
+        "show_toast": true,
+        "announce_to_chat": true,
+        "hidden": false
+    },
+    "criteria": {
+        "enter_pocket_dimension": {
+            "trigger": "travelerssuitcase:enter_pocket_dimension"
+        }
+    },
+    "requirements": [
+        [
+            "enter_pocket_dimension"
+        ]
+    ]
+}

src/main/resources/data/travelerssuitcase/dimension/pocket_dimension_.json

@@ -1,16 +0,0 @@
-{
-  "type": "travelerssuitcase:pocket_dimension_type",
-  "generator": {
-    "type": "minecraft:flat",
-    "settings": {
-      "biome": "travelerssuitcase:pocket_islands",
-      "layers": [
-        {
-          "block": "travelerssuitcase:portal",
-          "height": 1
-        }
-      ],
-      "structure_overrides": []
-    }
-  }
-}

src/main/resources/travelerssuitcase.mixins.json

@@ -5,6 +5,11 @@
   "compatibilityLevel": "JAVA_8",
   "refmap": "travelerssuitcase.refmap.json",
   "mixins": [
+    "MinecraftServerAccess",
+    "LevelStemMixin",
+    "MappedRegistryMixin",
+    "ServerWorldMixin",
+    "ServerChunkManagerMixin"
   ],
   "client": [
   ],