Add world ref api to handle stored world references for later use

Improve artifact PR comment with better message and supports forks

.github/workflows/generic.artifact_comment.yml

@@ -0,0 +1,84 @@
+name: 'Generic: Artifact Comment'
+
+on:
+  workflow_call:
+    inputs:
+      plugin_name:
+        description: 'Plugin name used by Generic: Test'
+        required: true
+        type: string
+
+jobs:
+  comment-artifact:
+    if: >-
+      github.event_name == 'workflow_run' &&
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success'
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      pull-requests: write
+    steps:
+      # Run separately so fork builds can post comments without a write token.
+      # Do not check out or execute code from the pull request in this workflow.
+      - name: Find pull request and artifact
+        id: artifact
+        uses: actions/github-script@v7
+        env:
+          PLUGIN_NAME: ${{ inputs.plugin_name }}
+        with:
+          script: |
+            const run = context.payload.workflow_run;
+            // Fork runs can have an empty pull_requests array in the event.
+            const pulls = await github.paginate(github.rest.pulls.list, {
+              ...context.repo,
+              state: 'open',
+              head: `${run.head_repository.owner.login}:${run.head_branch}`,
+              per_page: 100,
+            });
+            const pull = pulls.find(pr =>
+              pr.head.repo?.id === run.head_repository.id &&
+              pr.head.ref === run.head_branch &&
+              pr.head.sha === run.head_sha
+            );
+            if (!pull) {
+              core.info('No open pull request matches this build; skipping comment.');
+              return;
+            }
+
+            const artifacts = await github.paginate(github.rest.actions.listWorkflowRunArtifacts, {
+              ...context.repo,
+              run_id: run.id,
+              per_page: 100,
+            });
+            const artifact = artifacts.find(item =>
+              item.name === `${process.env.PLUGIN_NAME}-pr${pull.number}` && !item.expired
+            );
+            if (!artifact) {
+              core.info('No build artifact is available; skipping comment.');
+              return;
+            }
+
+            core.setOutput('number', pull.number);
+            core.setOutput('url', `${run.html_url}/artifacts/${artifact.id}`);
+
+      - name: Comment artifact
+        if: steps.artifact.outputs.number != ''
+        uses: marocchino/sticky-pull-request-comment@v3
+        with:
+          number: ${{ steps.artifact.outputs.number }}
+          header: build-artifact-${{ inputs.plugin_name }}
+          message: |
+            ### ✅ `${{ inputs.plugin_name }}` test build ready
+
+            The build and tests passed. This PR build is ready to try.
+
+            **[⬇️ Download test build](${{ steps.artifact.outputs.url }})**
+            Extract the downloaded ZIP to get the plugin JAR.
+
+            | Build details | |
+            | --- | --- |
+            | Commit | `${{ github.event.workflow_run.head_sha }}` |
+            | Workflow | [Run #${{ github.event.workflow_run.run_number }}](${{ github.event.workflow_run.html_url }}) |
+
+            <sub>Sign in to GitHub to download. Artifacts expire after the repository's retention period. This comment updates after successful builds.</sub>

.github/workflows/generic.platform_uploads.yml

@@ -107,7 +107,7 @@ jobs:
         files: '["${{ github.workspace }}/${{ inputs.plugin_name }}-${{ steps.release-info.outputs.tag_name }}.jar"]'
         name: ${{ steps.release-info.outputs.tag_name }}
         changelog: ${{ steps.release-artifact.outputs.body }}
-        game_versions: 26.2, 26.1.2, 26.1.1, 26.1, 1.21.11, 1.21.10, 1.21.9, 1.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4, 1.21.3, 1.21.2, 1.21.1, 1.21, 1.20.6, 1.20.5, 1.20.4, 1.20.3, 1.20.2, 1.20.1, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19, 1.18.2
+        game_versions: 26.3, 26.2, 26.1.2, 26.1.1, 26.1, 1.21.11, 1.21.10, 1.21.9, 1.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4, 1.21.3, 1.21.2, 1.21.1, 1.21, 1.20.6, 1.20.5, 1.20.4, 1.20.3, 1.20.2, 1.20.1, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19, 1.18.2
         version_type: ${{ steps.parse-release-type.outputs.release_type }}
         loaders: bukkit, spigot, paper, purpur
         dependencies: ${{ inputs.modrinth_dependencies }}
@@ -121,7 +121,7 @@ jobs:
         changelog: ${{ steps.release-artifact.outputs.body }}
         changelog_type: markdown
         display_name: ${{ steps.release-info.outputs.tag_name }}
-        game_versions: 26.2, 26.1.2, 26.1.1, 26.1, 1.21.11, 1.21.10, 1.21.9, 1.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4, 1.21.3, 1.21.2, 1.21.1, 1.21, 1.20.6, 1.20.5, 1.20.4, 1.20.3, 1.20.2, 1.20.1, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19, 1.18.2
+        game_versions: 26.3, 26.2, 26.1.2, 26.1.1, 26.1, 1.21.11, 1.21.10, 1.21.9, 1.21.8, 1.21.7, 1.21.6, 1.21.5, 1.21.4, 1.21.3, 1.21.2, 1.21.1, 1.21, 1.20.6, 1.20.5, 1.20.4, 1.20.3, 1.20.2, 1.20.1, 1.20, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19, 1.18.2
         release_type: ${{ steps.parse-release-type.outputs.release_type }}
         project_relations: ${{ inputs.dbo_project_relations }}
         file_path: ${{ github.workspace }}/${{ inputs.plugin_name }}-${{ steps.release-info.outputs.tag_name }}.jar
@@ -136,5 +136,5 @@ jobs:
         channel: ${{ steps.parse-release-type.outputs.release_type }}
         files: '[{"path": "${{ github.workspace }}/${{ inputs.plugin_name }}-${{ steps.release-info.outputs.tag_name }}.jar", "platforms": ["PAPER"]}]'
         description: ${{ steps.release-artifact.outputs.body }}
-        platform_dependencies: '{"PAPER": ["1.18.2-26.2"]}'
+        platform_dependencies: '{"PAPER": ["1.18.2-26.3"]}'
         plugin_dependencies: ${{ inputs.hangar_plugin_dependencies }}

.github/workflows/generic.test.yml

@@ -36,13 +36,3 @@ jobs:
         with:
           name: ${{ inputs.plugin_name }}-pr${{ github.event.pull_request.number }}
           path: build/libs/${{ inputs.plugin_name }}-pr${{ github.event.pull_request.number }}.jar
-
-  comment-artifact:
-    needs: test-and-artifact
-    runs-on: ubuntu-latest
-    permissions:
-      pull-requests: write
-    steps:
-      - uses: benwoo1110/artifact-comment-action@v1
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/pr.artifact_comment.yml

@@ -0,0 +1,15 @@
+name: 'PR: Artifact Comment'
+
+on:
+  workflow_run:
+    workflows: ['PR: Test']
+    types: [completed]
+
+jobs:
+  comment-artifact:
+    permissions:
+      actions: read
+      pull-requests: write
+    uses: ./.github/workflows/generic.artifact_comment.yml
+    with:
+      plugin_name: multiverse-core

build.gradle

@@ -37,7 +37,7 @@ dependencies {
     }
 
     // PlaceholderAPI
-    externalPlugin 'me.clip:placeholderapi:2.11.6'
+    externalPlugin 'me.clip:placeholderapi:2.12.3'
 
     // Command Framework
     shadowed 'co.aikar:acf-paper:0.5.1-SNAPSHOT'
@@ -48,7 +48,7 @@ dependencies {
     }
 
     // Utils
-    shadowed 'io.vavr:vavr:0.10.7'
+    shadowed 'io.vavr:vavr:1.0.1'
     shadowed 'org.glassfish.hk2:hk2-locator:3.1.1'
     shadowed('org.glassfish.hk2:hk2-inhabitant-generator:3.1.1') {
         exclude group: 'org.apache.maven', module: 'maven-core'
@@ -57,11 +57,11 @@ dependencies {
         exclude group: 'junit', module: 'junit'
     }
     shadowed 'de.themoep.idconverter:mappings:1.2-SNAPSHOT'
-    shadowed('org.bstats:bstats-bukkit:3.1.0') {
+    shadowed('org.bstats:bstats-bukkit:3.2.1') {
         exclude group: 'org.bukkit', module: 'bukkit'
     }
-    shadowed 'net.minidev:json-smart:2.5.2'
-    shadowed 'org.jetbrains:annotations:26.0.2'
+    shadowed 'net.minidev:json-smart:2.6.0'
+    shadowed 'org.jetbrains:annotations:26.1.0'
     shadowed 'io.papermc:paperlib:1.0.8'
 
     // Tests

src/main/java/org/mvplugins/multiverse/core/MultiverseCore.java

@@ -102,11 +102,12 @@ public class MultiverseCore extends MultiverseModule {
         SpawnCategoryMapper.buildSpawnCategoryMap();
 
         // Initialize the worlds
-        worldManagerProvider.get().initAllWorlds().andThenTry(() -> {
+        Try.run(() -> {
+            setUpLocales();
+            worldManagerProvider.get().initAllWorlds();
             loadEconomist(); // Setup economy here so vault is loaded
             loadAnchors();
             registerDynamicListeners(CoreListener.class);
-            setUpLocales();
             registerCommands(CoreCommand.class);
             registerDestinations();
             setupMetrics();

src/main/java/org/mvplugins/multiverse/core/PlaceholderExpansionHook.java

@@ -87,7 +87,8 @@ final class PlaceholderExpansionHook extends PlaceholderExpansion {
     @Override
     public @Nullable String onRequest(OfflinePlayer offlinePlayer, @NotNull String params) {
         // Split string in to an Array with underscores
-        List<String> paramsArray = Lists.newArrayList(REPatterns.UNDERSCORE.split(params));
+        List<String> paramsArray = Lists.newArrayList(
+                StringFormatter.parseQuotesInArgs(REPatterns.UNDERSCORE.split(params), "_"));
 
         // No placeholder defined
         if (paramsArray.isEmpty()) {

src/main/java/org/mvplugins/multiverse/core/command/MVCommandManager.java

@@ -12,6 +12,8 @@ import co.aikar.commands.LogLevel;
 import co.aikar.commands.PaperCommandManager;
 import co.aikar.commands.RootCommand;
 import com.dumptruckman.minecraft.util.Logging;
+import jakarta.annotation.PostConstruct;
+import jakarta.annotation.PreDestroy;
 import jakarta.inject.Inject;
 import jakarta.inject.Provider;
 import org.bukkit.Bukkit;
@@ -24,6 +26,7 @@ import org.mvplugins.multiverse.core.command.flag.CommandFlagsManager;
 import org.mvplugins.multiverse.core.command.queue.CommandQueueManager;
 import org.mvplugins.multiverse.core.config.CoreConfig;
 import org.mvplugins.multiverse.core.locale.PluginLocales;
+import org.mvplugins.multiverse.core.locale.message.LocalizedMessage;
 import org.mvplugins.multiverse.core.world.WorldManager;
 import org.mvplugins.multiverse.core.world.helpers.WorldNameChecker;
 
@@ -68,6 +71,16 @@ public class MVCommandManager extends PaperCommandManager {
         this.setDefaultExceptionHandler(new MVDefaultExceptionHandler());
     }
 
+    @PostConstruct
+    private void postConstruct() {
+        LocalizedMessage.setDefaultLocalesManager(getLocales());
+    }
+
+    @PreDestroy
+    private void preDestroy() {
+        LocalizedMessage.setDefaultLocalesManager(null);
+    }
+
     /**
      * Registers a list of commands and handles {@link LegacyAliasCommand} based on config option.
      * @param commands  The commands to register

src/main/java/org/mvplugins/multiverse/core/commands/CheckCommand.java

@@ -61,7 +61,7 @@ class CheckCommand extends CoreCommand {
                 replace("{location}").with(destination.getLocation(player)
                         .map(locationManipulation::locationToString)
                         .map(Message::of)
-                        .getOrElse(() -> Message.of(MVCorei18n.GENERIC_NULL, "Null!"))));
+                        .getOrElse(() -> Message.of(MVCorei18n.GENERIC_NULL))));
 
         // TODO: Show permission required for this particular destination
     }

src/main/java/org/mvplugins/multiverse/core/commands/CloneCommand.java

@@ -41,7 +41,7 @@ class CloneCommand extends CoreCommand {
     @Subcommand("clone")
     @CommandPermission("multiverse.core.clone")
     @CommandCompletion("@mvworlds:scope=loaded @empty @flags:groupName=" + Flags.NAME)
-    @Syntax("<world> <new-world-name> [--reset-world-config --reset-gamerules --reset-world-border]")
+    @Syntax("<world> <new-world-name> [--reset-world-config --reset-gamerules --reset-world-border --no-save]")
     @Description("{@@mv-core.clone.description}")
     void onCloneCommand(
             MVCommandIssuer issuer,
@@ -51,11 +51,11 @@ class CloneCommand extends CoreCommand {
             MultiverseWorld world,
 
             @Syntax("<new-world-name>")
-            @Description("{@@mv-core.clone.newWorld.description}")
+            @Description("{@@mv-core.clone.newworld.description}")
             String newWorldName,
 
             @Optional
-            @Syntax("[--reset-world-config --reset-gamerules --reset-world-border]")
+            @Syntax("[--reset-world-config --reset-gamerules --reset-world-border --no-save]")
             @Description("{@@mv-core.regen.other.description}")
             String[] flagArray) {
         ParsedCommandFlags parsedFlags = flags.parse(flagArray);

src/main/java/org/mvplugins/multiverse/core/commands/CreateCommand.java

@@ -56,7 +56,7 @@ class CreateCommand extends CoreCommand {
     @CommandPermission("multiverse.core.create")
     @CommandCompletion("@empty @environments @flags:groupName=" + Flags.NAME)
     @Syntax("<name> <environment> [--seed <seed> --generator <generator[:id]> --world-type <worldtype> " +
-            "--adjust-spawn --no-structures --generate-bonus-chest --force-spawn-position <x,y,z:pitch:yaw> " +
+            "--no-adjust-spawn --no-structures --generate-bonus-chest --force-spawn-position <x,y,z:pitch:yaw> " +
             "--biome <biome> --generator-settings <json-settings> --properties <prop1=value1,prop2=value2,...>]")
     @Description("{@@mv-core.create.description}")
     void onCreateCommand(
@@ -71,7 +71,7 @@ class CreateCommand extends CoreCommand {
             World.Environment environment,
 
             @Optional
-            @Syntax("[--seed <seed> --generator <generator[:id]> --world-type <worldtype> --adjust-spawn " +
+            @Syntax("[--seed <seed> --generator <generator[:id]> --world-type <worldtype> --no-adjust-spawn " +
                     "--no-structures --generate-bonus-chest --force-spawn-position <x,y,z:pitch:yaw> --biome <biome> " +
                     "--generator-settings <json-settings> --properties <prop1=value1,prop2=value2,...>]")
             @Description("{@@mv-core.create.flags.description}")

src/main/java/org/mvplugins/multiverse/core/commands/DeleteCommand.java

@@ -79,7 +79,7 @@ class DeleteCommand extends CoreCommand {
         commandQueueManager.addToQueue(CommandQueuePayload
                 .issuer(issuer)
                 .action(() -> runDeleteCommand(issuer, world, parsedFlags))
-                .prompt(Message.of(MVCorei18n.DELETE_PROMPT, "",
+                .prompt(Message.of(MVCorei18n.DELETE_PROMPT,
                         Replace.WORLD.with(world.getName()))));
     }
 

src/main/java/org/mvplugins/multiverse/core/commands/GameruleCommand.java

@@ -54,21 +54,21 @@ class GameruleCommand extends CoreCommand {
     @Subcommand("gamerule|rule set")
     @CommandPermission("multiverse.core.gamerule.set")
     @CommandCompletion("@gamerules @gamerulesvalues @mvworlds:multiple|*")
-    @Syntax("<Gamerule> <Gamerule value> [World or *]")
+    @Syntax("<gamerule> <value> [worlds|*]")
     @Description("{@@mv-core.gamerule.set.description}")
     void onGameruleSetCommand(
             MVCommandIssuer issuer,
 
-            @Syntax("<Gamerule>")
+            @Syntax("<gamerule>")
             @Description("{@@mv-core.gamerule.set.gamerule.description}")
             GameRule gamerule,
 
-            @Syntax("<Value>")
+            @Syntax("<value>")
             @Description("{@@mv-core.gamerule.set.value.description}")
             GameRuleValue gameRuleValue,
 
             @Flags("resolve=issuerAware,maxArgForAware=2")
-            @Syntax("[World or *]")
+            @Syntax("[worlds|*]")
             @Description("{@@mv-core.gamerule.set.world.description}")
             LoadedMultiverseWorld[] worlds) {
         Object value = gameRuleValue.value();
@@ -105,17 +105,17 @@ class GameruleCommand extends CoreCommand {
     @Subcommand("gamerule|rule reset")
     @CommandPermission("multiverse.core.gamerule.set")
     @CommandCompletion("@gamerules @mvworlds:multiple|*")
-    @Syntax("<Gamerule> [World or *]")
+    @Syntax("<gamerule> [worlds|*]")
     @Description("{@@mv-core.gamerule.reset.description}")
     void onGameruleResetCommand(
             MVCommandIssuer issuer,
 
-            @Syntax("<Gamerule>")
+            @Syntax("<gamerule>")
             @Description("{@@mv-core.gamerule.reset.gamerule.description}")
             GameRule gamerule,
 
             @Flags("resolve=issuerAware,maxArgForAware=1")
-            @Syntax("[World or *]")
+            @Syntax("[worlds|*]")
             @Description("{@@mv-core.gamerule.reset.world.description}")
             LoadedMultiverseWorld[] worlds) {
         AtomicBoolean success = new AtomicBoolean(true);
@@ -153,7 +153,7 @@ class GameruleCommand extends CoreCommand {
             MVCommandIssuer issuer,
 
             @Flags("resolve=issuerAware,maxArgForAware=0")
-            @Syntax("<world>")
+            @Syntax("[world]")
             @Description("{@@mv-core.gamerule.list.description.world}")
             LoadedMultiverseWorld world,
 

src/main/java/org/mvplugins/multiverse/core/commands/ImportCommand.java

@@ -43,7 +43,8 @@ class ImportCommand extends CoreCommand {
     @Subcommand("import")
     @CommandPermission("multiverse.core.import")
     @CommandCompletion("@mvworlds:scope=potential @environments @flags:groupName=" + Flags.NAME)
-    @Syntax("<name> <environment> [--generator <generator[:id]> --adjust-spawn --biome <biome>]")
+    @Syntax("<name> <environment> [--generator <generator[:id]> --no-adjust-spawn --biome <biome> " +
+            "--skip-folder-check --generator-settings <json-settings>]")
     @Description("{@@mv-core.import.description}")
     void onImportCommand(
             MVCommandIssuer issuer,
@@ -53,12 +54,13 @@ class ImportCommand extends CoreCommand {
             @Description("{@@mv-core.import.name.description}")
             String worldName,
 
-            @Syntax("<env>")
+            @Syntax("<environment>")
             @Description("{@@mv-core.import.env.description}")
             World.Environment environment,
 
             @Optional
-            @Syntax("[--generator <generator[:id]> --adjust-spawn --biome <biome>]")
+            @Syntax("[--generator <generator[:id]> --no-adjust-spawn --biome <biome> " +
+                    "--skip-folder-check --generator-settings <json-settings>]")
             @Description("{@@mv-core.import.other.description}")
             String[] flagArray) {
         ParsedCommandFlags parsedFlags = flags.parse(flagArray);

src/main/java/org/mvplugins/multiverse/core/commands/ListCommand.java

@@ -54,12 +54,12 @@ class ListCommand extends CoreCommand {
     @Subcommand("list")
     @CommandPermission("multiverse.core.list.worlds")
     @CommandCompletion("@flags:groupName=" + Flags.NAME)
-    @Syntax("--filter [filter] --page [page] --raw")
+    @Syntax("[--filter <filter>] [--page <page>] [--raw]")
     @Description("{{@mv-core.list.description}}")
     public void onListCommand(
             MVCommandIssuer issuer,
 
-            @Syntax("[--filter <filter>] [--page <page>]")
+            @Syntax("[--filter <filter>] [--page <page>] [--raw]")
             @Description("Filters the list of worlds by the given regex and displays the given page.")
             String[] flagArray) {
         ParsedCommandFlags parsedFlags = flags.parse(flagArray);

src/main/java/org/mvplugins/multiverse/core/commands/LoadCommand.java

@@ -39,7 +39,7 @@ class LoadCommand extends CoreCommand {
     @Subcommand("load")
     @CommandPermission("multiverse.core.load")
     @CommandCompletion("@mvworlds:scope=unloaded @flags:groupName=" + Flags.NAME)
-    @Syntax("<world>")
+    @Syntax("<world> [--skip-folder-check]")
     @Description("{@@mv-core.load.description}")
     void onLoadCommand(
             MVCommandIssuer issuer,

src/main/java/org/mvplugins/multiverse/core/commands/RegenCommand.java

@@ -70,7 +70,7 @@ class RegenCommand extends CoreCommand {
     @CommandPermission("multiverse.core.regen")
     @CommandCompletion("@mvworlds:scope=loaded @flags:groupName=" + Flags.NAME)
     @Syntax("<world> [--seed [seed]] [--reset-world-config] [--reset-gamerules] [--reset-world-border] " +
-            "[--remove-players [destination]]")
+            "[--keep-files <files>] [--remove-players [destination]]")
     @Description("{@@mv-core.regen.description}")
     void onRegenCommand(
             MVCommandIssuer issuer,
@@ -81,7 +81,7 @@ class RegenCommand extends CoreCommand {
 
             @Optional
             @Syntax("[--seed [seed]] [--reset-world-config] [--reset-gamerules] [--reset-world-border] " +
-                    "[--remove-players [destination]]")
+                    "[--keep-files <files>] [--remove-players [destination]]")
             @Description("{@@mv-core.regen.other.description}")
             String[] flagArray) {
         ParsedCommandFlags parsedFlags = flags.parse(flagArray);
@@ -89,7 +89,7 @@ class RegenCommand extends CoreCommand {
         commandQueueManager.addToQueue(CommandQueuePayload
                 .issuer(issuer)
                 .action(() -> runRegenCommand(issuer, world, parsedFlags))
-                .prompt(Message.of(MVCorei18n.REGEN_PROMPT, "",
+                .prompt(Message.of(MVCorei18n.REGEN_PROMPT,
                         Replace.WORLD.with(world.getName()))));
     }
 

src/main/java/org/mvplugins/multiverse/core/commands/SetSpawnCommand.java

@@ -40,12 +40,12 @@ class SetSpawnCommand extends CoreCommand {
     @Subcommand("setspawn")
     @CommandPermission("multiverse.core.spawn.set")
     @CommandCompletion("@flags:groupName=" + UnsafeFlags.NAME + " @flags:resolveUntil=arg1,groupName=" + UnsafeFlags.NAME)
-    @Syntax("[worldname:x,y,z[,pitch,yaw]] [--unsafe]")
+    @Syntax("[worldname:x,y,z[,yaw,pitch]] [--unsafe]")
     @Description("{@@mv-core.setspawn.description}")
     void onSetSpawnCommand(
             MVCommandIssuer issuer,
 
-            @Syntax("[worldname:x,y,z[,pitch,yaw]]")
+            @Syntax("[worldname:x,y,z[,yaw,pitch]]")
             @Description("{@@mv-core.setspawn.location.description}")
             PlayerLocation playerLocation,
 

src/main/java/org/mvplugins/multiverse/core/commands/SpawnCommand.java

@@ -62,7 +62,7 @@ final class SpawnCommand extends CoreCommand {
     @CommandPermission("@mvspawn")
     @CommandCompletion("@playersarray:checkPermissions=@mvspawnother|@flags:resolveUntil=arg1,groupName=" + UnsafeFlags.NAME
             + " @flags:groupName=" + UnsafeFlags.NAME)
-    @Syntax("[player]")
+    @Syntax("[player] [--unsafe]")
     @Description("{@@mv-core.spawn.description}")
     void onSpawnTpCommand(
             MVCommandIssuer issuer,

src/main/java/org/mvplugins/multiverse/core/commands/TeleportCommand.java

@@ -59,7 +59,7 @@ final class TeleportCommand extends CoreCommand {
     @CommandCompletion("@playersarray:checkPermissions=@mvteleportother|@destinations:byIssuerForArg=arg1 "
             + "@destinations:notByIssuerForArg=arg1|@flags:byIssuerForArg=arg1,groupName=" + Flags.NAME + " "
             + "@flags:notByIssuerForArg=arg1,groupName=" + Flags.NAME)
-    @Syntax("[player] <destination> [--unsafe]")
+    @Syntax("[player] <destination> [--unsafe --silent]")
     @Description("{@@mv-core.teleport.description}")
     void onTeleportCommand(
             MVCommandIssuer issuer,
@@ -74,7 +74,7 @@ final class TeleportCommand extends CoreCommand {
             DestinationInstance<?, ?> destination,
 
             @Optional
-            @Syntax("[--unsafe]")
+            @Syntax("[--unsafe --silent]")
             @Description("")
             String[] flagArray) {
         Player[] players = playersValue.value();

src/main/java/org/mvplugins/multiverse/core/commands/UnloadCommand.java

@@ -52,7 +52,7 @@ class UnloadCommand extends CoreCommand {
     @Subcommand("unload")
     @CommandPermission("multiverse.core.unload")
     @CommandCompletion("@mvworlds @flags:groupName=" + Flags.NAME)
-    @Syntax("<world> [--remove-players [destination]] [--no-save]")
+    @Syntax("<world> [--remove-players [destination]] [--no-unload-bukkit-world] [--no-save]")
     @Description("{@@mv-core.unload.description}")
     void onUnloadCommand(
             MVCommandIssuer issuer,
@@ -62,7 +62,7 @@ class UnloadCommand extends CoreCommand {
             LoadedMultiverseWorld world,
 
             @Optional
-            @Syntax("[--remove-players [destination]] [--no-save]")
+            @Syntax("[--remove-players [destination]] [--no-unload-bukkit-world] [--no-save]")
             @Description("{@@mv-core.gamerules.description.page}")
             String[] flagArray) {
         ParsedCommandFlags parsedFlags = flags.parse(flagArray);

src/main/java/org/mvplugins/multiverse/core/commands/WorldBorderCommand.java

@@ -50,10 +50,10 @@ final class WorldBorderCommand extends CoreCommand {
     void onWorldBorderCenter(
             MVCommandIssuer issuer,
 
-            @Syntax("[x]")
+            @Syntax("<x>")
             double x,
 
-            @Syntax("[z]")
+            @Syntax("<z>")
             double z,
 
             @Flags("resolve=issuerAware,maxArgForAware=0")

src/main/java/org/mvplugins/multiverse/core/config/CoreConfig.java

@@ -246,6 +246,16 @@ public final class CoreConfig {
         return configHandle.get(configNodes.endWorldNameFormat);
     }
 
+    @ApiStatus.AvailableSince("5.8")
+    public Try<Void> setWarnAliasConflicts(boolean warnAliasConflicts) {
+        return configHandle.set(configNodes.warnAliasConflicts, warnAliasConflicts);
+    }
+
+    @ApiStatus.AvailableSince("5.8")
+    public boolean getWarnAliasConflicts() {
+        return configHandle.get(configNodes.warnAliasConflicts);
+    }
+
     /**
      * {@inheritDoc}
      */

src/main/java/org/mvplugins/multiverse/core/config/CoreConfigNodes.java

@@ -200,6 +200,15 @@ final class CoreConfigNodes {
             .stringParser(DimensionFormatNodeStringParser.INSTANCE)
             .build());
 
+    final ConfigNode<Boolean> warnAliasConflicts = node(ConfigNode.builder("world.warn-alias-conflicts", Boolean.class)
+            .comment("")
+            .comment("Sets whether Multiverse will warn about alias duplicates when adding worlds or modifying aliases.")
+            .comment("Although not enforced, it is highly recommended to not have multiple worlds with the same alias or")
+            .comment("alias matching another world's name as it can cause confusion during world listing and selection in commands.")
+            .defaultValue(true)
+            .name("warn-alias-conflicts")
+            .build());
+
     private final ConfigHeaderNode teleportHeader = node(ConfigHeaderNode.builder("teleport")
             .comment("")
             .comment("")

src/main/java/org/mvplugins/multiverse/core/config/node/ConfigNode.java

@@ -492,6 +492,7 @@ public class ConfigNode<T> extends ConfigHeaderNode implements ValueNode<T> {
          * @deprecated Use {@link #onLoadAndChange(NodeChangeCallback)} instead.
          */
         @Deprecated(since = "5.4", forRemoval = true)
+        @ApiStatus.ScheduledForRemoval(inVersion = "6.0")
         public @NotNull B onSetValue(@NotNull BiConsumer<T, T> onSetValue) {
             return onLoadAndChange(onSetValue::accept);
         }

src/main/java/org/mvplugins/multiverse/core/exceptions/MultiverseException.java

@@ -1,6 +1,5 @@
 package org.mvplugins.multiverse.core.exceptions;
 
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import org.mvplugins.multiverse.core.locale.message.LocalizableMessage;

src/main/java/org/mvplugins/multiverse/core/exceptions/command/MVInvalidCommandArgument.java

@@ -2,6 +2,7 @@ package org.mvplugins.multiverse.core.exceptions.command;
 
 import co.aikar.commands.InvalidCommandArgument;
 import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
 import org.mvplugins.multiverse.core.locale.message.LocalizableMessage;
 import org.mvplugins.multiverse.core.locale.message.LocalizedMessage;
 import org.mvplugins.multiverse.core.locale.message.Message;
@@ -18,16 +19,20 @@ public class MVInvalidCommandArgument extends InvalidCommandArgument {
 
     @ApiStatus.AvailableSince("5.7")
     public static MVInvalidCommandArgument causeBy(Throwable throwable, boolean showSyntax) {
-        return (throwable instanceof LocalizableMessage localizableMessage)
-                ? of(localizableMessage.getLocalizableMessage(), showSyntax)
-                : new MVInvalidCommandArgument(throwable.getLocalizedMessage(), showSyntax);
+        if (throwable instanceof LocalizableMessage localizableMessage) {
+            Message message = localizableMessage.getLocalizableMessage();
+            return message == null
+                    ? new MVInvalidCommandArgument(throwable.getLocalizedMessage(), showSyntax)
+                    : of(message, showSyntax);
+        }
+        return new MVInvalidCommandArgument(throwable.getLocalizedMessage(), showSyntax);
     }
 
-    public static MVInvalidCommandArgument of(Message message) {
+    public static MVInvalidCommandArgument of(@NotNull Message message) {
         return of(message, true);
     }
 
-    public static MVInvalidCommandArgument of(Message message, boolean showSyntax) {
+    public static MVInvalidCommandArgument of(@NotNull Message message, boolean showSyntax) {
         return message instanceof LocalizedMessage
                 ? new MVInvalidCommandArgument((LocalizedMessage) message, showSyntax)
                 : new MVInvalidCommandArgument(message, showSyntax);
@@ -42,6 +47,6 @@ public class MVInvalidCommandArgument extends InvalidCommandArgument {
     }
 
     private MVInvalidCommandArgument(LocalizedMessage message, boolean showSyntax) {
-        super(message.getMessageKey(), showSyntax, message.getReplacements());
+        super(message.getMessageKey(), showSyntax, message.getRawReplacements());
     }
 }

src/main/java/org/mvplugins/multiverse/core/listeners/MVEntityListener.java

@@ -22,11 +22,13 @@ import org.bukkit.event.entity.EntitySpawnEvent;
 import org.bukkit.event.entity.FoodLevelChangeEvent;
 import org.bukkit.event.world.ChunkLoadEvent;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 import org.jvnet.hk2.annotations.Service;
 
 import org.mvplugins.multiverse.core.dynamiclistener.EventRunnable;
 import org.mvplugins.multiverse.core.dynamiclistener.annotations.EventClass;
 import org.mvplugins.multiverse.core.dynamiclistener.annotations.EventMethod;
+import org.mvplugins.multiverse.core.utils.compatibility.EntityCompatibility;
 import org.mvplugins.multiverse.core.world.WorldManager;
 
 import java.util.Arrays;
@@ -96,10 +98,7 @@ final class MVEntityListener implements CoreListener {
             @Override
             public void onEvent(PreCreatureSpawnEvent event) {
                 // Always allow custom command and plugins to spawn creatures
-                if (event.getReason() == SpawnReason.CUSTOM
-                        || event.getReason() == SpawnReason.COMMAND
-                        || event.getReason() == SpawnReason.BREEDING
-                        || event.getReason() == SpawnReason.SPAWNER_EGG) {
+                if (isAlwaysAllowedSpawnReason(event.getReason())) {
                     return;
                 }
 
@@ -127,10 +126,7 @@ final class MVEntityListener implements CoreListener {
         }
 
         // Always allow custom command and plugins to spawn creatures
-        if (event.getSpawnReason() == SpawnReason.CUSTOM
-                || event.getSpawnReason() == SpawnReason.COMMAND
-                || event.getSpawnReason() == SpawnReason.BREEDING
-                || event.getSpawnReason() == SpawnReason.SPAWNER_EGG) {
+        if (isAlwaysAllowedSpawnReason(event.getSpawnReason())) {
             return;
         }
 
@@ -168,6 +164,7 @@ final class MVEntityListener implements CoreListener {
                 .peek(world -> {
                     long count = Arrays.stream(event.getChunk().getEntities())
                             .filter(entity -> !(entity instanceof Player))
+                            .filter(entity -> !isAlwaysAllowedSpawnReason(EntityCompatibility.getEntitySpawnReason(entity)))
                             .filter(entity -> !world.getEntitySpawnConfig().shouldAllowSpawn(entity))
                             .peek(Entity::remove)
                             .count();
@@ -177,4 +174,11 @@ final class MVEntityListener implements CoreListener {
                     }
                 });
     }
+
+    private boolean isAlwaysAllowedSpawnReason(@Nullable SpawnReason reason) {
+        return reason == SpawnReason.CUSTOM
+                || reason == SpawnReason.COMMAND
+                || reason == SpawnReason.BREEDING
+                || reason == SpawnReason.SPAWNER_EGG;
+    }
 }

src/main/java/org/mvplugins/multiverse/core/locale/MVCorei18n.java

@@ -182,7 +182,7 @@ public enum MVCorei18n implements MessageKeyProvider {
 
     // /mv meta info
     META_INFO_DESCRIPTION,
-    META_INFO_WORLD,
+    META_INFO_WORLD_DESCRIPTION,
     META_INFO_HEADER,
     META_INFO_NOCONTENT,
 
@@ -370,6 +370,11 @@ public enum MVCorei18n implements MessageKeyProvider {
     TELEPORTFAILUREREASON_TELEPORT_FAILED_EXCEPTION,
     TELEPORTFAILUREREASON_EVENT_CANCELLED,
 
+    // alias name conflict
+    ALIASNAMECONFLICT_DETECTED,
+    ALIASNAMECONFLICT_DUPLICATEALIAS,
+    ALIASNAMECONFLICT_DUPLICATEWORLDNAME,
+
     // world manager result
     CLONEWORLD_INVALIDWORLDNAME,
     CLONEWORLD_WORLDEXISTFOLDER,

src/main/java/org/mvplugins/multiverse/core/locale/message/LocalizedMessage.java

@@ -1,17 +1,23 @@
 package org.mvplugins.multiverse.core.locale.message;
 
-import java.util.Objects;
-
 import co.aikar.commands.ACFUtil;
 import co.aikar.commands.CommandIssuer;
 import co.aikar.commands.Locales;
 import co.aikar.locales.MessageKey;
 import co.aikar.locales.MessageKeyProvider;
+import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 public final class LocalizedMessage extends Message implements MessageKeyProvider {
 
+    private static @Nullable Locales locales;
+
+    @ApiStatus.Internal
+    public static void setDefaultLocalesManager(@Nullable Locales locales) {
+        LocalizedMessage.locales = locales;
+    }
+
     private final @NotNull MessageKeyProvider messageKeyProvider;
 
     LocalizedMessage(
@@ -22,11 +28,33 @@ public final class LocalizedMessage extends Message implements MessageKeyProvide
         this.messageKeyProvider = messageKeyProvider;
     }
 
+    /**
+     * {@inheritDoc}
+     */
     @Override
     public MessageKey getMessageKey() {
         return messageKeyProvider.getMessageKey();
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public @NotNull String[] getReplacements() {
+        return locales == null ? super.getReplacements() : getReplacements(locales, null);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public @NotNull String formatted() {
+        return locales == null ? super.formatted() : formatted(locales, null);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
     @Override
     public @NotNull String formatted(@NotNull Locales locales, @Nullable CommandIssuer commandIssuer) {
         String[] parsedReplacements = getReplacements(locales, commandIssuer);

src/main/java/org/mvplugins/multiverse/core/locale/message/Message.java

@@ -6,9 +6,11 @@ import co.aikar.commands.ACFUtil;
 import co.aikar.commands.CommandIssuer;
 import co.aikar.commands.Locales;
 import co.aikar.locales.MessageKeyProvider;
+import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.mvplugins.multiverse.core.command.MVCommandManager;
 
 /**
  * A message that can be formatted with replacements and localized.
@@ -81,15 +83,45 @@ public sealed class Message permits LocalizedMessage {
     }
 
     /**
-     * Gets the replacements for this message.
+     * Gets the replacements for this message. This is the raw, non-localized parsing of replacements.
      * <br/>
      * This array is guaranteed to be of even length and suitable for use with
      * {@link ACFUtil#replaceStrings(String, String...)}.
      *
      * @return The replacements
+     *
+     * @since 5.8
+     */
+    @ApiStatus.AvailableSince("5.8")
+    public @NotNull String[] getRawReplacements() {
+        return toReplacementsArray(replacements);
+    }
+
+    /**
+     * Gets the replacements for this message with localization support when the plugin has loaded and injected its
+     * default {@link MVCommandManager#getLocales()} instance.
+     * Otherwise, it will fall back to use {@link getRawReplacements()}.
+     *
+     * @return The replacements
      */
     public @NotNull String[] getReplacements() {
-        return toReplacementsArray(replacements);
+        return getRawReplacements();
+    }
+
+    /**
+     * Gets the replacements for this message with localization support based on the command issuer's locale config.
+     * <br/>
+     * This array is guaranteed to be of even length and suitable for use with
+     * {@link ACFUtil#replaceStrings(String, String...)}.
+     *
+     * @param issuer The command issuer the message is for
+     * @return The replacements
+     *
+     * @since 5.8
+     */
+    @ApiStatus.AvailableSince("5.8")
+    public @NotNull String[] getReplacements(@NotNull CommandIssuer issuer) {
+        return getReplacements(issuer.getManager().getLocales(), issuer);
     }
 
     /**
@@ -116,20 +148,36 @@ public sealed class Message permits LocalizedMessage {
     }
 
     /**
-     * Gets the formatted message.
+     * Gets the raw formatted message.
      * <br/>
      * This is the raw, non-localized message with replacements applied.
+     * This method will never use the locale message key.
      *
      * @return The formatted message
+     *
+     * @since 5.8
      */
-    public @NotNull String formatted() {
-        String[] parsedReplacements = getReplacements();
+    @ApiStatus.AvailableSince("5.8")
+    public @NotNull String rawFormatted() {
+        String[] parsedReplacements = getRawReplacements();
         if (parsedReplacements.length == 0) {
             return raw();
         }
         return ACFUtil.replaceStrings(message, parsedReplacements);
     }
 
+    /**
+     * Gets the formatted message.
+     * <br/>
+     * This is the localized message with replacements applied when the plugin has loaded and injected its default
+     * {@link MVCommandManager#getLocales()} instance. Otherwise, it will fall back to use {@link rawFormatted()}.
+     *
+     * @return The formatted message
+     */
+    public @NotNull String formatted() {
+        return rawFormatted();
+    }
+
     /**
      * Gets the formatted message from localization data.
      * <br/>
@@ -146,9 +194,9 @@ public sealed class Message permits LocalizedMessage {
      * Gets the formatted message from localization data.
      * <br/>
      * This is the localized message with replacements applied. The message is localized using the locale of the given
-     * command issuer, if not null.
+     * command issuer.
      *
-     * @param commandIssuer The command issuer the message is for, or null for the console (default locale)
+     * @param commandIssuer The command issuer the message is for.
      * @return The formatted, localized message
      */
     public @NotNull String formatted(@NotNull CommandIssuer commandIssuer) {
@@ -178,7 +226,7 @@ public sealed class Message permits LocalizedMessage {
         int i = 0;
         for (MessageReplacement replacement : replacements) {
             replacementsArray[i++] = replacement.getKey();
-            replacementsArray[i++] = replacement.getReplacement().fold(s -> s, Message::formatted);
+            replacementsArray[i++] = replacement.getReplacement().fold(s -> s, Message::rawFormatted);
         }
         return replacementsArray;
     }

src/main/java/org/mvplugins/multiverse/core/utils/ReflectHelper.java

@@ -189,6 +189,7 @@ public final class ReflectHelper {
      * the failure case more explicitly.
      */
     @Deprecated(forRemoval = true, since = "5.7")
+    @ApiStatus.ScheduledForRemoval(inVersion = "6.0")
     @Nullable
     public static Class<?> getClass(String classPath) {
         try {
@@ -211,6 +212,7 @@ public final class ReflectHelper {
      * used to handle the failure case more explicitly.
      */
     @Deprecated(forRemoval = true, since = "5.7")
+    @ApiStatus.ScheduledForRemoval(inVersion = "6.0")
     @Nullable
     public static <C> Method getMethod(Class<C> clazz, String methodName, Class<?>... parameterTypes) {
         try {
@@ -235,6 +237,7 @@ public final class ReflectHelper {
      * used to handle the failure case more explicitly.
      */
     @Deprecated(forRemoval = true, since = "5.7")
+    @ApiStatus.ScheduledForRemoval(inVersion = "6.0")
     @Nullable
     public static <C> Method getMethod(C classInstance, String methodName, Class<?>... parameterTypes) {
         return getMethod(classInstance.getClass(), methodName, parameterTypes);
@@ -254,6 +257,7 @@ public final class ReflectHelper {
      * be used to handle the failure case more explicitly.
      */
     @Deprecated(forRemoval = true, since = "5.7")
+    @ApiStatus.ScheduledForRemoval(inVersion = "6.0")
     @Nullable
     @SuppressWarnings("unchecked")
     public static <C, R> R invokeMethod(C classInstance, Method method, Object...parameters) {
@@ -276,6 +280,7 @@ public final class ReflectHelper {
      * handle the failure case more explicitly.
      */
     @Deprecated(forRemoval = true, since = "5.7")
+    @ApiStatus.ScheduledForRemoval(inVersion = "6.0")
     @Nullable
     public static <C> Field getField(Class<C> clazz, String fieldName) {
         try {
@@ -299,6 +304,7 @@ public final class ReflectHelper {
      * handle the failure case more explicitly.
      */
     @Deprecated(forRemoval = true, since = "5.7")
+    @ApiStatus.ScheduledForRemoval(inVersion = "6.0")
     @Nullable
     public static <C> Field getField(C classInstance, String fieldName) {
         return getField(classInstance.getClass(), fieldName);
@@ -318,6 +324,7 @@ public final class ReflectHelper {
      * used to handle the failure case more explicitly.
      */
     @Deprecated(forRemoval = true, since = "5.7")
+    @ApiStatus.ScheduledForRemoval(inVersion = "6.0")
     @Nullable
     public static <C, V> V getFieldValue(C classInstance, @Nullable Field field, @NotNull Class<V> fieldType) {
         try {
@@ -345,6 +352,7 @@ public final class ReflectHelper {
      * which returns a {@link Try} that can be used to handle the failure case more explicitly.
      */
     @Deprecated(forRemoval = true, since = "5.7")
+    @ApiStatus.ScheduledForRemoval(inVersion = "6.0")
     @Nullable
     public static <C, V> V getFieldValue(C classInstance, @Nullable String fieldName, @NotNull Class<V> fieldType) {
         return getFieldValue(classInstance, getField(classInstance, fieldName), fieldType);

src/main/java/org/mvplugins/multiverse/core/utils/StringFormatter.java

@@ -118,6 +118,20 @@ public final class StringFormatter {
      * @return The parsed args
      */
     public static @NotNull Collection<String> parseQuotesInArgs(@NotNull String[] args) {
+        return parseQuotesInArgs(args, " ");
+    }
+
+    /**
+     * Parse quotes in args into a single string. E.g. ["\"my", "string\""] -> ["my string"]
+     *
+     * @param args      The args to parse
+     * @param separator The separator to use between args when joining them
+     * @return The parsed args
+     *
+     * @since 5.8
+     */
+    @ApiStatus.AvailableSince("5.8")
+    public static @NotNull Collection<String> parseQuotesInArgs(@NotNull String[] args, @NotNull String separator) {
         List<String> result = new ArrayList<>(args.length);
         StringBuilder current = new StringBuilder();
         boolean inQuotes = false;
@@ -131,13 +145,13 @@ public final class StringFormatter {
                 quoteStartIndex = i;
                 current.append(arg.substring(1));
             } else if (inQuotes && arg.endsWith("\"")) {
-                current.append(" ").append(arg, 0, arg.length() - 1);
+                current.append(separator).append(arg, 0, arg.length() - 1);
                 result.add(current.toString());
                 current.setLength(0);
                 inQuotes = false;
                 quoteStartIndex = -1;
             } else if (inQuotes) {
-                current.append(" ").append(arg);
+                current.append(separator).append(arg);
             } else if (arg.startsWith("\"") && arg.endsWith("\"") && arg.length() > 1) {
                 // Fully quoted in one token
                 result.add(arg.substring(1, arg.length() - 1));

src/main/java/org/mvplugins/multiverse/core/utils/compatibility/EntityCompatibility.java

@@ -0,0 +1,40 @@
+package org.mvplugins.multiverse.core.utils.compatibility;
+
+import org.bukkit.entity.Entity;
+import org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.mvplugins.multiverse.core.utils.ReflectHelper;
+
+/**
+ * Compatibility class used to handle API changes in {@link Entity} class.
+ */
+// TODO: Consider making this part of the public API in v5.9.
+@ApiStatus.Internal
+public final class EntityCompatibility {
+
+    private static final boolean HAS_GET_ENTITY_SPAWN_REASON_METHOD;
+
+    static {
+        HAS_GET_ENTITY_SPAWN_REASON_METHOD = ReflectHelper.hasMethod(Entity.class, "getEntitySpawnReason");
+    }
+
+    /**
+     * Gets the reason that initially spawned the entity when supported by the server.
+     *
+     * @param entity The entity to query.
+     * @return The entity's spawn reason, or null when the API is unavailable.
+     */
+    @Nullable
+    public static SpawnReason getEntitySpawnReason(@NotNull Entity entity) {
+        if (HAS_GET_ENTITY_SPAWN_REASON_METHOD) {
+            return entity.getEntitySpawnReason();
+        }
+        return null;
+    }
+
+    private EntityCompatibility() {
+        throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
+    }
+}

src/main/java/org/mvplugins/multiverse/core/utils/result/Attempt.java

@@ -49,7 +49,7 @@ public sealed interface Attempt<T, F extends FailureReason> permits Attempt.Succ
     @ApiStatus.AvailableSince("5.7")
     static <T, F extends FailureReason> Attempt.Failure<T, F> failureRef(
             F failureReason, MessageReplacement... messageReplacements) {
-        return new Failure<>(failureReason, Message.of(failureReason, "Failed!", messageReplacements));
+        return new Failure<>(failureReason, Message.of(failureReason, messageReplacements));
     }
 
     /**

src/main/java/org/mvplugins/multiverse/core/utils/result/Result.java

@@ -220,7 +220,7 @@ public sealed interface Result<S extends SuccessReason, F extends FailureReason>
 
         Success(S successReason, MessageReplacement[] replacements) {
             this.successReason = successReason;
-            this.message = Message.of(successReason, "Success!", replacements);
+            this.message = Message.of(successReason, replacements);
         }
 
         @Override
@@ -273,7 +273,7 @@ public sealed interface Result<S extends SuccessReason, F extends FailureReason>
 
         Failure(F failureReason, MessageReplacement[] replacements) {
             this.failureReason = failureReason;
-            this.message = Message.of(failureReason, "Failed!", replacements);
+            this.message = Message.of(failureReason, replacements);
         }
 
         @Override

src/main/java/org/mvplugins/multiverse/core/world/LoadedMultiverseWorld.java

@@ -13,7 +13,7 @@ import org.bukkit.WorldType;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 
-import org.mvplugins.multiverse.core.config.CoreConfig;
+import org.mvplugins.multiverse.core.MultiverseCore;
 import org.mvplugins.multiverse.core.teleportation.BlockSafety;
 import org.mvplugins.multiverse.core.teleportation.LocationManipulation;
 import org.mvplugins.multiverse.core.world.entity.EntityPurger;
@@ -22,6 +22,11 @@ import org.mvplugins.multiverse.core.world.location.SpawnLocation;
 
 /**
  * Extension of {@link MultiverseWorld} that represents a world that is currently loaded with bukkit world object.
+ * <p>
+ * Do not store instances of this class for future use during runtime. Worlds can be unloaded, removed, reloaded,
+ * or regenerated, making stored instances stale. Instead, store a {@link MultiverseWorldRef} obtained from
+ * {@link #asRef()} and call {@link MultiverseWorldRef#getLoaded()} when a loaded world is needed. The reference
+ * returns an empty Option when the world is unloaded or no longer managed by Multiverse.
  */
 public final class LoadedMultiverseWorld extends MultiverseWorld {
 
@@ -34,16 +39,13 @@ public final class LoadedMultiverseWorld extends MultiverseWorld {
     LoadedMultiverseWorld(
             @NotNull World world,
             @NotNull WorldConfig worldConfig,
-            @NotNull CoreConfig config,
-            @NotNull BlockSafety blockSafety,
-            @NotNull LocationManipulation locationManipulation,
-            @NotNull EntityPurger entityPurger
-    ) {
-        super(worldConfig, config);
+            @NotNull MultiverseCore multiverseCore
+            ) {
+        super(worldConfig, multiverseCore);
         this.worldUid = world.getUID();
-        this.blockSafety = blockSafety;
-        this.locationManipulation = locationManipulation;
-        this.entityPurger = entityPurger;
+        this.blockSafety = multiverseCore.getServiceLocator().getService(BlockSafety.class);
+        this.locationManipulation = multiverseCore.getServiceLocator().getService(LocationManipulation.class);
+        this.entityPurger = multiverseCore.getServiceLocator().getService(EntityPurger.class);
 
         setupWorldConfig(world);
         setupSpawnLocation(world);

src/main/java/org/mvplugins/multiverse/core/world/MultiverseWorld.java

@@ -20,6 +20,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import org.jetbrains.annotations.UnmodifiableView;
+import org.mvplugins.multiverse.core.MultiverseCore;
 import org.mvplugins.multiverse.core.config.CoreConfig;
 import org.mvplugins.multiverse.core.config.handle.StringPropertyHandle;
 import org.mvplugins.multiverse.core.utils.text.ChatTextFormatter;
@@ -29,6 +30,11 @@ import org.mvplugins.multiverse.core.world.entity.EntitySpawnConfig;
 
 /**
  * Represents a world handled by Multiverse which has all the custom properties provided by Multiverse.
+ * <p>
+ * Do not store instances of this class for future use during runtime. Worlds can be unloaded, removed, reloaded,
+ * or regenerated, making stored instances stale. Instead, store a {@link MultiverseWorldRef} obtained from
+ * {@link #asRef()} and retrieve the current world instance when needed. The reference returns an empty Option
+ * when the world is no longer available.
  */
 public sealed class MultiverseWorld permits LoadedMultiverseWorld {
     /**
@@ -37,11 +43,13 @@ public sealed class MultiverseWorld permits LoadedMultiverseWorld {
     WorldConfig worldConfig;
 
     protected final CoreConfig config;
+    private final WorldStore worldStore;
     private String colourlessAlias = "";
 
-    MultiverseWorld(WorldConfig worldConfig, CoreConfig config) {
+    MultiverseWorld(@NotNull WorldConfig worldConfig, @NotNull MultiverseCore multiverseCore) {
         this.worldConfig = worldConfig;
-        this.config = config;
+        this.config = multiverseCore.getServiceLocator().getService(CoreConfig.class);
+        this.worldStore = multiverseCore.getServiceLocator().getService(WorldStore.class);
         this.worldConfig.setMVWorld(this);
         updateColourlessAlias();
     }
@@ -125,6 +133,22 @@ public sealed class MultiverseWorld permits LoadedMultiverseWorld {
                 .map(world -> (LoadedMultiverseWorld) world);
     }
 
+    /**
+     * Creates a reference to this world's key for storing and retrieving the current world instance at runtime.
+     * <p>
+     * Store this reference when retaining a world across reloads or regeneration, which make stored
+     * {@link MultiverseWorld} and {@link LoadedMultiverseWorld} instances stale. Use {@link MultiverseWorldRef#get()}
+     * or {@link MultiverseWorldRef#getLoaded()} to retrieve the current instance when needed.
+     *
+     * @return A reference that looks up the current world instance using this world's key.
+     *
+     * @since 5.9
+     */
+    @ApiStatus.AvailableSince("5.9")
+    public MultiverseWorldRef asRef() {
+        return new MultiverseWorldRef(getKey(), worldStore);
+    }
+
     /**
      * Gets the properties handler of this world.
      *

src/main/java/org/mvplugins/multiverse/core/world/MultiverseWorldRef.java

@@ -0,0 +1,57 @@
+package org.mvplugins.multiverse.core.world;
+
+import io.vavr.control.Option;
+import org.bukkit.NamespacedKey;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * A reference to a world by its key that can be stored and used to retrieve the current world instance at runtime.
+ * <p>
+ * Stored {@link MultiverseWorld} and {@link LoadedMultiverseWorld} instances become stale when a world is reloaded
+ * or regenerated. This reference looks up the world on each call to {@link #get()} or {@link #getLoaded()}, allowing
+ * callers to keep the reference across those operations and retrieve the current instance when needed.
+ * Store this reference rather than caching the world instances returned by its methods.
+ * <p>
+ * Obtain a reference using {@link MultiverseWorld#asRef()}. Resolving a reference does not load the world.
+ *
+ * @since 5.9
+ */
+@ApiStatus.AvailableSince("5.9")
+public class MultiverseWorldRef {
+
+    private final NamespacedKey worldKey;
+    private final WorldStore worldStore;
+
+    MultiverseWorldRef(@NotNull NamespacedKey worldKey, @NotNull WorldStore worldStore) {
+        this.worldKey = worldKey;
+        this.worldStore = worldStore;
+    }
+
+    /**
+     * Gets the current world instance for this reference's key, whether loaded or unloaded.
+     * The world is looked up on each call so the returned instance reflects reloads and regeneration.
+     *
+     * @return The current world instance wrapped in an Option, or None if the world is no longer managed by Multiverse.
+     *
+     * @since 5.9
+     */
+    @ApiStatus.AvailableSince("5.9")
+    public Option<MultiverseWorld> get() {
+        return worldStore.getWorld(worldKey);
+    }
+
+    /**
+     * Gets the current loaded world instance for this reference's key without loading the world.
+     * The world is looked up on each call so the returned instance reflects reloads and regeneration.
+     *
+     * @return The current loaded world instance wrapped in an Option, or None if the world is unloaded or no longer
+     *         managed by Multiverse.
+     *
+     * @since 5.9
+     */
+    @ApiStatus.AvailableSince("5.9")
+    public Option<LoadedMultiverseWorld> getLoaded() {
+        return worldStore.getLoadedWorld(worldKey);
+    }
+}

src/main/java/org/mvplugins/multiverse/core/world/WorldConfigNodes.java

@@ -17,6 +17,7 @@ import org.bukkit.configuration.MemoryConfiguration;
 import org.jetbrains.annotations.NotNull;
 
 import org.mvplugins.multiverse.core.MultiverseCore;
+import org.mvplugins.multiverse.core.command.MVCommandManager;
 import org.mvplugins.multiverse.core.config.CoreConfig;
 import org.mvplugins.multiverse.core.config.node.MapConfigNode;
 import org.mvplugins.multiverse.core.config.node.serializer.NodeSerializer;
@@ -27,6 +28,7 @@ import org.mvplugins.multiverse.core.config.node.NodeGroup;
 import org.mvplugins.multiverse.core.economy.MVEconomist;
 import org.mvplugins.multiverse.core.utils.MaterialConverter;
 import org.mvplugins.multiverse.core.utils.text.ChatTextFormatter;
+import org.mvplugins.multiverse.core.world.helpers.AliasNameConflictChecker;
 import org.mvplugins.multiverse.core.world.helpers.EnforcementHandler;
 import org.mvplugins.multiverse.core.world.key.WorldKeyOrName;
 import org.mvplugins.multiverse.core.world.location.NullSpawnLocation;
@@ -41,15 +43,21 @@ final class WorldConfigNodes {
 
     private final NodeGroup nodes = new NodeGroup();
     private WorldManager worldManager;
+    private WorldStore worldStore;
     private EnforcementHandler enforcementHandler;
     private CoreConfig config;
+    private AliasNameConflictChecker aliasNameConflictChecker;
+    private MVCommandManager commandManager;
     private WorldKeyOrName keyOrName;
     private MultiverseWorld world = null;
 
     WorldConfigNodes(@NotNull MultiverseCore multiverseCore, @NotNull WorldKeyOrName keyOrName) {
         this.worldManager = multiverseCore.getServiceLocator().getService(WorldManager.class);
+        this.worldStore = multiverseCore.getServiceLocator().getService(WorldStore.class);
         this.enforcementHandler = multiverseCore.getServiceLocator().getService(EnforcementHandler.class);
         this.config = multiverseCore.getServiceLocator().getService(CoreConfig.class);
+        this.aliasNameConflictChecker = multiverseCore.getServiceLocator().getService(AliasNameConflictChecker.class);
+        this.commandManager  = multiverseCore.getServiceLocator().getService(MVCommandManager.class);
         this.keyOrName = keyOrName;
     }
 
@@ -93,14 +101,18 @@ final class WorldConfigNodes {
 
     final ConfigNode<String> alias = node(ConfigNode.builder("alias", String.class)
             .defaultValue("")
-            .onLoadAndChange((oldValue, newValue) -> {
-                worldManager.getWorldStore().changeAlias(
+            .onLoadAndChange((sender, oldValue, newValue) -> {
+                worldStore.changeAlias(
                         ChatTextFormatter.removeColor(oldValue),
                         ChatTextFormatter.removeColor(newValue),
                         keyOrName.usableKey()
                 );
                 if (world == null) return;
                 world.updateColourlessAlias();
+                if (config.getWarnAliasConflicts()) {
+                    aliasNameConflictChecker.checkDuplicateFor(world)
+                            .sendConflictMessage(commandManager.getCommandIssuer(sender));
+                }
             }));
 
     final ConfigNode<Boolean> allowAdvancementGrant = node(ConfigNode.builder("allow-advancement-grant", Boolean.class)

src/main/java/org/mvplugins/multiverse/core/world/WorldManager.java

@@ -31,6 +31,7 @@ import org.jetbrains.annotations.Nullable;
 import org.jetbrains.annotations.Unmodifiable;
 import org.jvnet.hk2.annotations.Service;
 
+import org.mvplugins.multiverse.core.MultiverseCore;
 import org.mvplugins.multiverse.core.config.CoreConfig;
 import org.mvplugins.multiverse.core.event.world.MVWorldClonedEvent;
 import org.mvplugins.multiverse.core.event.world.MVWorldCreatedEvent;
@@ -45,8 +46,6 @@ import org.mvplugins.multiverse.core.locale.MVCorei18n;
 import org.mvplugins.multiverse.core.locale.message.Message;
 import org.mvplugins.multiverse.core.locale.message.MessageReplacement.Replace;
 import org.mvplugins.multiverse.core.permissions.CorePermissions;
-import org.mvplugins.multiverse.core.teleportation.BlockSafety;
-import org.mvplugins.multiverse.core.teleportation.LocationManipulation;
 import org.mvplugins.multiverse.core.utils.ServerProperties;
 import org.mvplugins.multiverse.core.utils.compatibility.BukkitCompatibility;
 import org.mvplugins.multiverse.core.utils.compatibility.WorldCompatibility;
@@ -54,8 +53,8 @@ import org.mvplugins.multiverse.core.utils.compatibility.WorldCreatorCompatibili
 import org.mvplugins.multiverse.core.utils.result.Attempt;
 import org.mvplugins.multiverse.core.utils.result.FailureReason;
 import org.mvplugins.multiverse.core.utils.FileUtils;
+import org.mvplugins.multiverse.core.utils.text.ChatTextFormatter;
 import org.mvplugins.multiverse.core.world.biomeprovider.BiomeProviderFactory;
-import org.mvplugins.multiverse.core.world.entity.EntityPurger;
 import org.mvplugins.multiverse.core.world.generators.GeneratorProvider;
 import org.mvplugins.multiverse.core.world.helpers.DataStore.GameRulesStore;
 import org.mvplugins.multiverse.core.world.helpers.DataTransfer;
@@ -95,6 +94,7 @@ public final class WorldManager {
             "data/paper/metadata.dat"  // New papermc format for 26.1+
     );
 
+    private final MultiverseCore multiverseCore;
     private final WorldStore worldStore;
     private final List<String> unloadTracker;
     private final List<String> loadTracker;
@@ -103,44 +103,37 @@ public final class WorldManager {
     private final BiomeProviderFactory biomeProviderFactory;
     private final GeneratorProvider generatorProvider;
     private final FileUtils fileUtils;
-    private final BlockSafety blockSafety;
-    private final LocationManipulation locationManipulation;
     private final PluginManager pluginManager;
     private final CorePermissions corePermissions;
     private final ServerProperties serverProperties;
     private final CoreConfig config;
-    private final EntityPurger entityPurger;
     private final Provider<PotentialWorldFinder> potentialWorldFinder;
 
     @Inject
     WorldManager(
+            @NotNull MultiverseCore multiverseCore,
             @NotNull WorldStore worldStore,
             @NotNull WorldsConfigManager worldsConfigManager,
             @NotNull WorldNameChecker worldNameChecker,
             @NotNull BiomeProviderFactory biomeProviderFactory,
             @NotNull GeneratorProvider generatorProvider,
             @NotNull FileUtils fileUtils,
-            @NotNull BlockSafety blockSafety,
-            @NotNull LocationManipulation locationManipulation,
             @NotNull PluginManager pluginManager,
             @NotNull CorePermissions corePermissions,
             @NotNull ServerProperties serverProperties,
             @NotNull CoreConfig config,
-            @NotNull EntityPurger entityPurger,
             @NotNull Provider<PotentialWorldFinder> potentialWorldFinder) {
+        this.multiverseCore = multiverseCore;
         this.worldStore = worldStore;
         this.worldsConfigManager = worldsConfigManager;
         this.worldNameChecker = worldNameChecker;
         this.biomeProviderFactory = biomeProviderFactory;
         this.generatorProvider = generatorProvider;
         this.fileUtils = fileUtils;
-        this.blockSafety = blockSafety;
-        this.locationManipulation = locationManipulation;
         this.pluginManager = pluginManager;
         this.corePermissions = corePermissions;
         this.serverProperties = serverProperties;
         this.config = config;
-        this.entityPurger = entityPurger;
         this.potentialWorldFinder = potentialWorldFinder;
 
         this.unloadTracker = new ArrayList<>();
@@ -154,10 +147,14 @@ public final class WorldManager {
      */
     @ApiStatus.Internal
     public Try<Void> initAllWorlds() {
-        return updateWorldsFromConfig().andThenTry(() -> {
-            importExistingWorlds();
-            autoLoadWorlds();
-        }).flatMap(ignore -> saveWorldsConfig());
+        return updateWorldsFromConfig()
+                .andThenTry(this::importExistingWorlds)
+                .andThenTry(this::autoLoadWorlds)
+                .flatMap(ignore -> saveWorldsConfig())
+                .onFailure(ex -> {
+                    Logging.severe("Failed to load worlds from config: %s", ex.getMessage());
+                    ex.printStackTrace();
+                });
     }
 
     /**
@@ -240,7 +237,10 @@ public final class WorldManager {
                 .filter(world -> !isLoadedWorld(world) && world.isAutoLoad())
                 .forEach(world -> loadWorld(LoadWorldOptions.world(world))
                         .onFailure(failure ->
-                                Logging.severe("Failed to autoload world %s: %s", world.getName(), failure))
+                                Logging.severe("Failed to autoload world '%s': %s: %s",
+                                        world.getName(),
+                                        failure,
+                                        ChatTextFormatter.removeColor(failure.getFailureMessage().formatted())))
                         .onSuccess(newMVWorld ->
                                 Logging.fine("Autoloaded world %s", newMVWorld.getName())));
     }
@@ -278,15 +278,24 @@ public final class WorldManager {
         WorldKeyOrName keyOrName = keyOrNameWithOptions.keyOrName();
         CreateWorldOptions options = keyOrNameWithOptions.options();
         String generatorString = generatorProvider.parseGeneratorString(keyOrName.usableName(), options.generator());
-        WorldCreator worldCreator = WorldCreatorCompatibility.ofKeyOrName(keyOrName)
-                .environment(options.environment())
-                .generateStructures(options.generateStructures())
-                .generatorSettings(options.generatorSettings())
-                .seed(options.seed())
-                .type(options.worldType());
-        WorldCreatorCompatibility.setBonusChest(worldCreator, options.bonusChest());
-        options.forcedSpawnPosition().peek(position -> WorldCreatorCompatibility.setForcedSpawnPosition(worldCreator, position));
-        return addBiomeProviderToCreator(worldCreator, keyOrName.usableName(), options.biome())
+
+        return Try.of(() -> {
+                    WorldCreator creator = WorldCreatorCompatibility.ofKeyOrName(keyOrName)
+                            .environment(options.environment())
+                            .generateStructures(options.generateStructures())
+                            .generatorSettings(options.generatorSettings())
+                            .seed(options.seed())
+                            .type(options.worldType());
+                    WorldCreatorCompatibility.setBonusChest(creator, options.bonusChest());
+                    options.forcedSpawnPosition()
+                            .peek(position -> WorldCreatorCompatibility.setForcedSpawnPosition(creator, position));
+                    return creator;
+                })
+                .fold(throwable -> Attempt.<WorldCreator, WorldCreatorFailureReason>failure(WorldCreatorFailureReason.BUKKIT_CREATION_FAILED,
+                                Replace.WORLD.with(keyOrName.usableName()),
+                                Replace.ERROR.with(throwable)),
+                        Attempt::<WorldCreator, WorldCreatorFailureReason>success)
+                .mapAttempt(creator -> addBiomeProviderToCreator(creator, keyOrName.usableName(), options.biome()))
                 .mapAttempt(creator -> addGeneratorToCreator(creator, generatorString))
                 .mapAttempt(this::createBukkitWorld)
                 .transform(CreateFailureReason.WORLD_CREATOR_FAILED)
@@ -355,11 +364,15 @@ public final class WorldManager {
         WorldKeyOrName keyOrName = keyOrNameWithOptions.keyOrName();
         ImportWorldOptions options = keyOrNameWithOptions.options();
         String generatorString = generatorProvider.parseGeneratorString(keyOrName.usableName(), options.generator());
-        WorldCreator worldCreator = WorldCreatorCompatibility.ofKeyOrName(keyOrName)
-                .environment(options.environment())
-                .generatorSettings(options.generatorSettings());
 
-        return addBiomeProviderToCreator(worldCreator, keyOrName.usableName(), options.biome())
+        return Try.of(() -> WorldCreatorCompatibility.ofKeyOrName(keyOrName)
+                        .environment(options.environment())
+                        .generatorSettings(options.generatorSettings()))
+                .fold(throwable -> Attempt.<WorldCreator, WorldCreatorFailureReason>failure(WorldCreatorFailureReason.BUKKIT_CREATION_FAILED,
+                                Replace.WORLD.with(keyOrName.usableName()),
+                                Replace.ERROR.with(throwable)),
+                        Attempt::<WorldCreator, WorldCreatorFailureReason>success)
+                .mapAttempt(creator -> addBiomeProviderToCreator(creator, keyOrName.usableName(), options.biome()))
                 .mapAttempt(creator -> addGeneratorToCreator(creator, generatorString))
                 .mapAttempt(this::createBukkitWorld)
                 .transform(ImportFailureReason.WORLD_CREATOR_FAILED)
@@ -396,7 +409,7 @@ public final class WorldManager {
     }
 
     private MultiverseWorld newMultiverseWorld(WorldConfig worldConfig) {
-        MultiverseWorld mvWorld = new MultiverseWorld(worldConfig, config);
+        MultiverseWorld mvWorld = new MultiverseWorld(worldConfig, multiverseCore);
         worldStore.putUnloadedWorld(mvWorld);
         corePermissions.addWorldPermissions(mvWorld);
         return mvWorld;
@@ -435,10 +448,7 @@ public final class WorldManager {
         LoadedMultiverseWorld loadedWorld = new LoadedMultiverseWorld(
                 world,
                 worldConfig,
-                config,
-                blockSafety,
-                locationManipulation,
-                entityPurger
+                multiverseCore
         );
         worldStore.putLoadedWorld(loadedWorld);
         saveWorldsConfig();
@@ -524,10 +534,14 @@ public final class WorldManager {
             }
         }
 
-        WorldCreator worldCreator = WorldCreatorCompatibility.ofNameAndKey(mvWorld.getKey(), mvWorld.getName())
-                .environment(mvWorld.getEnvironment())
-                .seed(mvWorld.getSeed());
-        return addBiomeProviderToCreator(worldCreator, mvWorld.getName(), mvWorld.getBiome())
+        return Try.of(() -> WorldCreatorCompatibility.ofNameAndKey(mvWorld.getKey(), mvWorld.getName())
+                        .environment(mvWorld.getEnvironment())
+                        .seed(mvWorld.getSeed()))
+                .fold(throwable -> Attempt.<WorldCreator, WorldCreatorFailureReason>failure(WorldCreatorFailureReason.BUKKIT_CREATION_FAILED,
+                                Replace.WORLD.with(mvWorld.getName()),
+                                Replace.ERROR.with(throwable)),
+                        Attempt::<WorldCreator, WorldCreatorFailureReason>success)
+                .mapAttempt(creator -> addBiomeProviderToCreator(creator, mvWorld.getName(), mvWorld.getBiome()))
                 .mapAttempt(creator -> addGeneratorToCreator(creator, mvWorld.getGenerator()))
                 .mapAttempt(this::createBukkitWorld)
                 .transform(LoadFailureReason.WORLD_CREATOR_FAILED)
@@ -567,10 +581,7 @@ public final class WorldManager {
         LoadedMultiverseWorld loadedWorld = new LoadedMultiverseWorld(
                 bukkitWorld,
                 worldConfig,
-                config,
-                blockSafety,
-                locationManipulation,
-                entityPurger
+                multiverseCore
         );
         worldStore.putLoadedWorld(loadedWorld);
         saveWorldsConfig();
@@ -1253,10 +1264,6 @@ public final class WorldManager {
                 });
     }
 
-    WorldStore getWorldStore() {
-        return worldStore;
-    }
-
     /**
      * A simple pair wrapper for convenience to pass both the world key or name and the options together between methods
      * when parsing world options.

src/main/java/org/mvplugins/multiverse/core/world/WorldsConfigManager.java

@@ -18,7 +18,9 @@ import org.jetbrains.annotations.NotNull;
 import org.jvnet.hk2.annotations.Service;
 
 import org.mvplugins.multiverse.core.MultiverseCore;
+import org.mvplugins.multiverse.core.utils.ServerProperties;
 import org.mvplugins.multiverse.core.utils.result.Attempt;
+import org.mvplugins.multiverse.core.world.helpers.DimensionFinder;
 import org.mvplugins.multiverse.core.world.key.WorldKeyOrName;
 import org.mvplugins.multiverse.core.world.key.WorldKeyParseFailReason;
 
@@ -34,16 +36,18 @@ final class WorldsConfigManager {
 
     private final SortedMap<WorldKeyOrName, WorldConfig> worldConfigMap;
     private final File worldConfigFile;
+    private final ServerProperties serverProperties;
     private YamlConfiguration worldsConfig;
 
     private final MultiverseCore multiverseCore;
 
     @Inject
-    WorldsConfigManager(@NotNull MultiverseCore core, @NotNull MultiverseCore multiverseCore) {
+    WorldsConfigManager(@NotNull MultiverseCore multiverseCore, @NotNull ServerProperties serverProperties) {
         worldConfigMap = new TreeMap<>();
-        worldConfigFile = core.getDataFolder().toPath().resolve(CONFIG_FILENAME).toFile();
+        worldConfigFile = multiverseCore.getDataFolder().toPath().resolve(CONFIG_FILENAME).toFile();
 
         this.multiverseCore = multiverseCore;
+        this.serverProperties = serverProperties;
     }
 
     /**
@@ -202,9 +206,59 @@ final class WorldsConfigManager {
             worldConfigMap.remove(s);
         }
 
+        migrateLevelNameChange();
+
         return new NewAndRemovedWorlds(newWorldsAdded, worldsRemoved);
     }
 
+    private void migrateLevelNameChange() {
+        serverProperties.getLevelName()
+                .peek(levelName -> {
+                    boolean didMigrate = migrateLevelNameChange(
+                            WorldKeyOrName.parseKey(NamespacedKey.minecraft("overworld")),
+                            levelName
+                    );
+                    didMigrate =  migrateLevelNameChange(
+                            WorldKeyOrName.parseKey(NamespacedKey.minecraft("the_nether")),
+                            DimensionFinder.DEFAULT_NETHER_FORMAT.replaceOverworld(levelName)
+                    ) || didMigrate;
+                    didMigrate =  migrateLevelNameChange(
+                            WorldKeyOrName.parseKey(NamespacedKey.minecraft("the_end")),
+                            DimensionFinder.DEFAULT_END_FORMAT.replaceOverworld(levelName)
+                    ) || didMigrate;
+
+                    if  (didMigrate) {
+                        Logging.warning("We have detected and migrated your default world's name due to a level-name change.");
+                        Logging.warning("Please check your worlds.yml file and world list to ensure everything is correct.");
+                        Logging.warning("Additionally, all references to the old world name will no longer work. " +
+                                "Please update all references within your configuration files/plugins.");
+                    }
+                });
+    }
+
+    private boolean migrateLevelNameChange(WorldKeyOrName keyOrName, String newWorldName) {
+        return getWorldConfig(keyOrName).map(worldConfig -> {
+            if (newWorldName.equals(worldConfig.getLegacyWorldName())) {
+                return false;
+            }
+
+            boolean hasConflictKey = WorldKeyOrName.parseKey(newWorldName).map(this::getWorldConfig)
+                    .fold(failure -> false, Option::isDefined);
+            if (hasConflictKey) {
+                Logging.severe("Unable to migrate default world's name caused by level-name change.");
+                Logging.severe("We have detected a clash between the default name '%s' and an existing non-default world in your worlds.yml file.", newWorldName);
+                Logging.severe("Please change the level-name in server.properties to something else and restart the server.");
+                return false;
+            }
+
+            Logging.info("Updating legacy world name for %s from %s to %s due to level-name change.",
+                    keyOrName, worldConfig.getLegacyWorldName(), newWorldName);
+            worldConfig.setLegacyWorldName(newWorldName);
+            worldConfig.save();
+            return true;
+        }).getOrElse(false);
+    }
+
     /**
      * Whether the worlds.yml file has been loaded.
      *

src/main/java/org/mvplugins/multiverse/core/world/entity/SpawnCategoryConfig.java

@@ -73,7 +73,7 @@ public final class SpawnCategoryConfig {
     }
 
     private void applyTickPerSpawns(@NotNull World bukkitWorld) {
-        if (!config.getApplyEntitySpawnLimit()) {
+        if (!config.getApplyEntitySpawnRate()) {
             Logging.finer("World %s %s skipping setTicksPerSpawns due to core config", world.getName(), spawnCategory);
             return;
         }

src/main/java/org/mvplugins/multiverse/core/world/helpers/AliasNameConflictChecker.java

@@ -0,0 +1,157 @@
+package org.mvplugins.multiverse.core.world.helpers;
+
+import com.google.common.base.Strings;
+import jakarta.inject.Inject;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.NotNull;
+import org.jvnet.hk2.annotations.Service;
+import org.mvplugins.multiverse.core.command.MVCommandIssuer;
+import org.mvplugins.multiverse.core.locale.MVCorei18n;
+import org.mvplugins.multiverse.core.locale.message.MessageReplacement.Replace;
+import org.mvplugins.multiverse.core.utils.text.ChatTextFormatter;
+import org.mvplugins.multiverse.core.world.MultiverseWorld;
+import org.mvplugins.multiverse.core.world.WorldManager;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.mvplugins.multiverse.core.locale.message.MessageReplacement.replace;
+
+/**
+ * Checks world aliases for conflicts with other world aliases and names.
+ *
+ * @since 5.8
+ */
+@ApiStatus.AvailableSince("5.8")
+@Service
+public class AliasNameConflictChecker {
+
+    private final WorldManager worldManager;
+
+    @Inject
+    private AliasNameConflictChecker(@NotNull WorldManager worldManager) {
+        this.worldManager = worldManager;
+    }
+
+    /**
+     * Checks whether the target world's alias conflicts with another world's alias or name.
+     * Color formatting and letter case are ignored when aliases are compared.
+     *
+     * @param targetWorld The world whose alias should be checked.
+     * @return The detected alias conflicts.
+     *
+     * @since 5.8
+     */
+    @ApiStatus.AvailableSince("5.8")
+    public @NotNull AliasNameConflictResult checkDuplicateFor(MultiverseWorld targetWorld) {
+        AliasNameConflictResult aliasNameConflictResult = new AliasNameConflictResult(targetWorld);
+        String targetWorldAlias = ChatTextFormatter.removeColor(targetWorld.getAlias());
+        if (Strings.isNullOrEmpty(targetWorldAlias)) {
+            return aliasNameConflictResult;
+        }
+
+        for (MultiverseWorld otherWorld : worldManager.getWorlds()) {
+            if (otherWorld.getKey().equals(targetWorld.getKey())) {
+                continue;
+            }
+            if (targetWorldAlias.equalsIgnoreCase(ChatTextFormatter.removeColor(otherWorld.getAlias()))) {
+                aliasNameConflictResult.getDuplicateAliases().add(otherWorld);
+            }
+            if (targetWorldAlias.equalsIgnoreCase(otherWorld.getName())) {
+                aliasNameConflictResult.getDuplicateWorldNames().add(otherWorld);
+            }
+        }
+        return aliasNameConflictResult;
+    }
+
+    /**
+     * Contains the alias conflicts detected for a world.
+     *
+     * @since 5.8
+     */
+    @ApiStatus.AvailableSince("5.8")
+    public static class AliasNameConflictResult {
+        private final MultiverseWorld targetWorld;
+        private final List<MultiverseWorld> duplicateAliases;
+        private final List<MultiverseWorld> duplicateWorldNames;
+
+        private AliasNameConflictResult(@NotNull MultiverseWorld targetWorld) {
+            this.targetWorld = targetWorld;
+            duplicateAliases  = new ArrayList<>();
+            duplicateWorldNames = new ArrayList<>();
+        }
+
+        /**
+         * Sends localized messages describing the detected conflicts to the command issuer.
+         * No message is sent when there are no conflicts.
+         *
+         * @param issuer The command issuer to notify.
+         *
+         * @since 5.8
+         */
+        @ApiStatus.AvailableSince("5.8")
+        public void sendConflictMessage(MVCommandIssuer issuer) {
+            if (!hasConflict()) {
+                return;
+            }
+            issuer.sendError(MVCorei18n.ALIASNAMECONFLICT_DETECTED,
+                    Replace.WORLD.with(targetWorld.getName()),
+                    replace("{alias}").with(targetWorld.getColourlessAlias()));
+            duplicateAliases.forEach(conflictingWorld ->
+                    issuer.sendError(MVCorei18n.ALIASNAMECONFLICT_DUPLICATEALIAS,
+                            Replace.WORLD.with(conflictingWorld.getName()),
+                            replace("{alias}").with(conflictingWorld.getColourlessAlias())));
+            duplicateWorldNames.forEach(conflictingWorld ->
+                    issuer.sendError(MVCorei18n.ALIASNAMECONFLICT_DUPLICATEWORLDNAME,
+                            Replace.WORLD.with(conflictingWorld.getName())));
+        }
+
+        /**
+         * Gets whether any alias or world name conflicts were detected.
+         *
+         * @return {@code true} if at least one conflict was detected, otherwise {@code false}.
+         *
+         * @since 5.8
+         */
+        @ApiStatus.AvailableSince("5.8")
+        public boolean hasConflict() {
+            return !duplicateAliases.isEmpty() || !duplicateWorldNames.isEmpty();
+        }
+
+        /**
+         * Gets the world whose alias was checked.
+         *
+         * @return The checked world.
+         *
+         * @since 5.8
+         */
+        @ApiStatus.AvailableSince("5.8")
+        public @NotNull MultiverseWorld getTargetWorld() {
+            return targetWorld;
+        }
+
+        /**
+         * Gets the worlds whose aliases match the target world's alias.
+         *
+         * @return The worlds with conflicting aliases.
+         *
+         * @since 5.8
+         */
+        @ApiStatus.AvailableSince("5.8")
+        public @NotNull List<MultiverseWorld> getDuplicateAliases() {
+            return duplicateAliases;
+        }
+
+        /**
+         * Gets the worlds whose names match the target world's alias.
+         *
+         * @return The worlds with names that conflict with the target world's alias.
+         *
+         * @since 5.8
+         */
+        @ApiStatus.AvailableSince("5.8")
+        public @NotNull List<MultiverseWorld> getDuplicateWorldNames() {
+            return duplicateWorldNames;
+        }
+    }
+}

src/main/java/org/mvplugins/multiverse/core/world/options/CloneWorldOptions.java

@@ -126,6 +126,8 @@ public final class CloneWorldOptions implements KeepWorldSettingsOptions {
      * Gets the name of the new world.
      *
      * @return The name of the new world.
+     *
+     * @deprecated Use {@link #newWorldKeyOrName()} instead.
      */
     @Deprecated(forRemoval = true, since = "5.7")
     @ApiStatus.ScheduledForRemoval(inVersion = "6.0")

src/main/java/org/mvplugins/multiverse/core/world/options/CreateWorldOptions.java

@@ -101,10 +101,13 @@ public final class CreateWorldOptions {
      * Gets the name of the world to create.
      *
      * @return The name of the world to create.
+     *
+     * @deprecated Use {@link #keyOrName()} instead.
      */
     @Deprecated(forRemoval = true, since = "5.7")
+    @ApiStatus.ScheduledForRemoval(inVersion = "6.0")
     public @NotNull String worldName() {
-        return keyOrName.fold(name -> name ,WorldKeyOrName::usableName);
+        return keyOrName.fold(name -> name, WorldKeyOrName::usableName);
     }
 
     /**

src/main/java/org/mvplugins/multiverse/core/world/options/ImportWorldOptions.java

@@ -85,11 +85,13 @@ public final class ImportWorldOptions {
      * Gets the name of the world to create.
      *
      * @return The name of the world to create.
+     *
+     * @deprecated Use {@link #keyOrName()} instead.
      */
     @Deprecated(forRemoval = true, since = "5.7")
     @ApiStatus.ScheduledForRemoval(inVersion = "6.0")
     public @NotNull String worldName() {
-        return keyOrName.fold(name -> name ,WorldKeyOrName::usableName);
+        return keyOrName.fold(name -> name, WorldKeyOrName::usableName);
     }
 
     /**

src/main/resources/multiverse-core_en.properties

@@ -32,7 +32,7 @@ mv-core.check.location=The destination's location is: &f{location}
 # /mv clone
 mv-core.clone.description=Clones a world.
 mv-core.clone.world.description=The target world to clone.
-mv-core.clone.newWorld.description=The new cloned world name.
+mv-core.clone.newworld.description=The new cloned world name.
 mv-core.clone.cloning=Cloning world '{world}' to '{newworld}'...
 mv-core.clone.success=&aWorld cloned to '{world}'!
 
@@ -53,7 +53,7 @@ mv-core.coordinates.description=Simply sends your coordinates
 mv-core.coordinates.info.title=&b--- Location Information ---
 mv-core.coordinates.info.world=&bWorld: &f{world}
 mv-core.coordinates.info.alias=&bAlias: &f{alias}
-mv-core.coordinates.info.worldScale=&bWorld Scale: &f{scale}
+mv-core.coordinates.info.worldscale=&bWorld Scale: &f{scale}
 mv-core.coordinates.info.coordinates=&bCoordinates: &f{coordinates}
 mv-core.coordinates.info.direction=&bDirection: &f{direction}
 
@@ -356,6 +356,11 @@ mv-core.teleportfailurereason.teleport.failed=The teleport was rejected. Please
 mv-core.teleportfailurereason.teleport.failed.exception=An error occurred during the teleport. Check server logs for more details.
 mv-core.teleportfailurereason.event.cancelled=The teleport was cancelled by another plugin.
 
+# alias name conflict
+mv-core.aliasnameconflict.detected=Alias conflict detected for world '{world}' with alias '{alias}'. This may cause world list and selection to be confusing!
+mv-core.aliasnameconflict.duplicatealias= - Conflicts with '{world}' world's alias: '{alias}'
+mv-core.aliasnameconflict.duplicateworldname= - Conflicts with world name: '{world}'
+
 # world manager result
 mv-core.cloneworld.invalidworldname=World '{world}' contains invalid characters!
 mv-core.cloneworld.worldexistfolder=World '{world}' exists in server folders! You need to delete it first before cloning.
@@ -379,14 +384,14 @@ mv-core.importworld.worldexistunloaded=World '{world}' already exists, but it's
 mv-core.importworld.worldexistloaded=World '{world}' already exists!
 mv-core.importworld.worldfolderinvalid=World '{world}' folder contents does not seem to be a valid world! Make sure it contains the correct world structure of data and region folders.\n&cIf the server software does something different with world folders, or you are very certain the world is valid, use '&3--skip-folder-check&c' flag.
 mv-core.importworld.bukkitenvironmentmismatch=Environment mismatch detected!&f The world '{world}' is already loaded with environment '{bukkitEnvironment}', but Multiverse is trying to import it with environment '{mvEnvironment}'.
-mv-core.importworld.bukkitnamespacemismatch=Namespace mismatch detected!&f The world '{world}' is already loaded with namespace '{bukkitNamespace}', but Multiverse is trying to import it with namespace '{mvNamespace}'.
+mv-core.importworld.bukkitnamespacedkeymismatch=Namespace mismatch detected!&f The world '{world}' is already loaded with namespace '{bukkitNamespace}', but Multiverse is trying to import it with namespace '{mvNamespace}'.
 
 mv-core.loadworld.worldalreadyloading=World '{world}' is already loading! Please wait...
 mv-core.loadworld.worldnonexistent=World '{world}' not found! Use '&a/mv create {world} <environment>&f' to create it.
 mv-core.loadworld.worldexistfolder=World '{world}' exists in server folders, but it's not known to Multiverse!&f Type '&a/mv import {world} <environment>&f' if you wish to import it.
 mv-core.loadworld.worldexistloaded=World '{world}' is already loaded!
 mv-core.loadworld.bukkitenvironmentmismatch=Environment mismatch detected!&f The world '{world}' is already loaded with environment '{bukkitEnvironment}', but Multiverse is trying to load it with environment '{mvEnvironment}'.
-mv-core.loadworld.bukkitnamespacemismatch=Namespace mismatch detected!&f The world '{world}' is already loaded with namespace '{bukkitNamespace}', but Multiverse is trying to load it with namespace '{mvNamespace}'.
+mv-core.loadworld.bukkitnamespacedkeymismatch=Namespace mismatch detected!&f The world '{world}' is already loaded with namespace '{bukkitNamespace}', but Multiverse is trying to load it with namespace '{mvNamespace}'.
 
 mv-core.removeworld.worldnonexistent=World '{world}' not found!
 

src/main/resources/multiverse-core_es.properties

@@ -32,7 +32,7 @@ mv-core.check.location=La localización de su destino es: &f{location}
 # /mv clone
 mv-core.clone.description=Clona un mundo.
 mv-core.clone.world.description=El mundo a clonar.
-mv-core.clone.newWorld.description=El nombre del nuevo mundo clonado.
+mv-core.clone.newworld.description=El nombre del nuevo mundo clonado.
 mv-core.clone.cloning=Clonando mundo '{world}' a '{newworld}'...
 mv-core.clone.success=&a¡Mundo clonado a '{world}'!
 
@@ -53,7 +53,7 @@ mv-core.coordinates.description=Simple y llanamente te muestra tus coordenadas.
 mv-core.coordinates.info.title=&b--- Información de la localización ---
 mv-core.coordinates.info.world=&bMundo: &f{world}
 mv-core.coordinates.info.alias=&bAlias: &f{alias}
-mv-core.coordinates.info.worldScale=&bEscala del mundo: &f{scale}
+mv-core.coordinates.info.worldscale=&bEscala del mundo: &f{scale}
 mv-core.coordinates.info.coordinates=&bCoordenadas: &f{coordinates}
 mv-core.coordinates.info.direction=&bDirección: &f{direction}
 
@@ -330,6 +330,11 @@ mv-core.teleportfailurereason.teleport.failed=Algo ha evitado la teletransportac
 mv-core.teleportfailurereason.teleport.failed.exception=Un error ha ocurrido durante la teletransportación. Mira la consola para ver los detalles.
 mv-core.teleportfailurereason.event.cancelled=El teletransporte fue cancelado por otro plugin.
 
+# alias name conflict
+mv-core.aliasnameconflict.detected=Se ha detectado un conflicto de alias para el mundo '{world}' con alias '{alias}'. Esto puede hacer que la lista y selección de mundos sea confusa.
+mv-core.aliasnameconflict.duplicatealias= - Entra en conflicto con el alias del mundo '{world}': '{alias}'
+mv-core.aliasnameconflict.duplicateworldname= - Entra en conflicto con el nombre del mundo: '{world}'
+
 # world manager result
 mv-core.cloneworld.invalidworldname=¡El mundo '{world}' contiene caracteres inválidos!
 mv-core.cloneworld.worldexistfolder=¡El mundo '{world}' ya existe en los archivos del servidor! Necesitas eliminarlo antes de clonarlo.

src/main/resources/multiverse-core_pl.properties

@@ -32,7 +32,7 @@ mv-core.check.location=&fLokalizacja celu: &a{location}
 # /mv clone
 mv-core.clone.description=Klonuje świat.
 mv-core.clone.world.description=Świat do sklonowania.
-mv-core.clone.newWorld.description=Nazwa nowego sklonowanego świata.
+mv-core.clone.newworld.description=Nazwa nowego sklonowanego świata.
 mv-core.clone.cloning=&e&l! &fTrwa klonowanie świata '&a{world}&f' do '&a{newworld}&f'...
 mv-core.clone.success=&a&l✔ &fŚwiat został sklonowany jako '&a{world}&f'!
 
@@ -56,7 +56,7 @@ mv-core.coordinates.description=Wysyła twoje koordynaty.
 mv-core.coordinates.info.title=&a&l--- Informacje o Lokalizacji ---
 mv-core.coordinates.info.world=&fŚwiat: &a{world}
 mv-core.coordinates.info.alias=&fAlias: &a{alias}
-mv-core.coordinates.info.worldScale=&fSkala świata: &a{scale}
+mv-core.coordinates.info.worldscale=&fSkala świata: &a{scale}
 mv-core.coordinates.info.coordinates=&fKoordynaty: &a{coordinates}
 mv-core.coordinates.info.direction=&fKierunek: &a{direction}
 
@@ -365,6 +365,11 @@ mv-core.teleportfailurereason.teleport.failed=&c&l✘ &cTeleportacja została od
 mv-core.teleportfailurereason.teleport.failed.exception=&c&l✘ &cWystąpił błąd podczas teleportacji. Sprawdź logi serwera po więcej informacji.
 mv-core.teleportfailurereason.event.cancelled=&c&l✘ &cTeleportacja została anulowana przez inny plugin.
 
+# alias name conflict
+mv-core.aliasnameconflict.detected=&c&l✘ &cWykryto konflikt aliasu dla świata '&a{world}&c' z aliasem '&a{alias}&c'. Może to utrudnić czytelność listy światów i ich wybieranie!
+mv-core.aliasnameconflict.duplicatealias= - Konflikt z aliasem świata '&a{world}&r': '&a{alias}&r'
+mv-core.aliasnameconflict.duplicateworldname= - Konflikt z nazwą świata: '&a{world}&r'
+
 # world manager result
 mv-core.cloneworld.invalidworldname=&c&l✘ &cŚwiat '&a{world}&c' zawiera niedozwolone znaki!
 mv-core.cloneworld.worldexistfolder=&c&l✘ &cŚwiat '&a{world}&c' istnieje już w folderach serwera! Musisz go najpierw usunąć przed klonowaniem.
@@ -388,14 +393,14 @@ mv-core.importworld.worldexistunloaded=&e&l! &eŚwiat '&a{world}&e' już istniej
 mv-core.importworld.worldexistloaded=&c&l✘ &cŚwiat '&a{world}&c' już istnieje!
 mv-core.importworld.worldfolderinvalid=&c&l✘ &cFolder świata '&a{world}&c' nie wygląda na poprawny świat! Upewnij się, że zawiera poprawną strukturę folderów data oraz region.\n&eJeśli oprogramowanie serwera działa inaczej lub masz pewność, że świat jest poprawny, użyj flagi '&a--skip-folder-check&e'.
 mv-core.importworld.bukkitenvironmentmismatch=&c&l✘ &cWykryto niezgodność environment! &fŚwiat '&a{world}&f' jest już załadowany z environment '&a{bukkitEnvironment}&f', ale Multiverse próbuje zaimportować go jako '&a{mvEnvironment}&f'.
-mv-core.importworld.bukkitnamespacemismatch=&c&l✘ &cWykryto niezgodność namespace! &fŚwiat '&a{world}&f' jest już załadowany z namespace '&a{bukkitNamespace}&f', ale Multiverse próbuje zaimportować go jako '&a{mvNamespace}&f'.
+mv-core.importworld.bukkitnamespacedkeymismatch=&c&l✘ &cWykryto niezgodność namespace! &fŚwiat '&a{world}&f' jest już załadowany z namespace '&a{bukkitNamespace}&f', ale Multiverse próbuje zaimportować go jako '&a{mvNamespace}&f'.
 
 mv-core.loadworld.worldalreadyloading=&e&l! &eŚwiat '&a{world}&e' jest już ładowany! Poczekaj...
 mv-core.loadworld.worldnonexistent=&c&l✘ &cŚwiat '&a{world}&c' nie istnieje! Użyj '&a/mv create {world} <environment>&f', aby go stworzyć.
 mv-core.loadworld.worldexistfolder=&e&l! &eŚwiat '&a{world}&e' istnieje w folderach serwera, ale nie jest znany Multiverse! &fWpisz '&a/mv import {world} <environment>&f', jeśli chcesz go zaimportować.
 mv-core.loadworld.worldexistloaded=&e&l! &eŚwiat '&a{world}&e' jest już załadowany!
 mv-core.loadworld.bukkitenvironmentmismatch=&c&l✘ &cWykryto niezgodność environment! &fŚwiat '&a{world}&f' jest już załadowany z environment '&a{bukkitEnvironment}&f', ale Multiverse próbuje załadować go jako '&a{mvEnvironment}&f'.
-mv-core.loadworld.bukkitnamespacemismatch=&c&l✘ &cWykryto niezgodność namespace! &fŚwiat '&a{world}&f' jest już załadowany z namespace '&a{bukkitNamespace}&f', ale Multiverse próbuje załadować go jako '&a{mvNamespace}&f'.
+mv-core.loadworld.bukkitnamespacedkeymismatch=&c&l✘ &cWykryto niezgodność namespace! &fŚwiat '&a{world}&f' jest już załadowany z namespace '&a{bukkitNamespace}&f', ale Multiverse próbuje załadować go jako '&a{mvNamespace}&f'.
 
 mv-core.removeworld.worldnonexistent=&c&l✘ &cNie znaleziono świata '&a{world}&c'!
 

src/main/resources/multiverse-core_ru.properties

@@ -32,7 +32,7 @@ mv-core.check.location=Местоположение пункта назначе
 # /mv clone
 mv-core.clone.description=Клонирует мир.
 mv-core.clone.world.description=Целевой мир для клонирования.
-mv-core.clone.newWorld.description=Название нового клонированного мира.
+mv-core.clone.newworld.description=Название нового клонированного мира.
 mv-core.clone.cloning=Клонирование мира '{world}' в '{newworld}'...
 mv-core.clone.success=&aМир клонирован в '{world}'!
 
@@ -53,7 +53,7 @@ mv-core.coordinates.description=Просто отправляет ваши ко
 mv-core.coordinates.info.title=&b--- Информация о местоположении ---
 mv-core.coordinates.info.world=&bМир: &f{world}
 mv-core.coordinates.info.alias=&bПсевдоним: &f{alias}
-mv-core.coordinates.info.worldScale=&bМасштаб мира: &f{scale}
+mv-core.coordinates.info.worldscale=&bМасштаб мира: &f{scale}
 mv-core.coordinates.info.coordinates=&bКоординаты: &f{coordinates}
 mv-core.coordinates.info.direction=&bНаправление: &f{direction}
 
@@ -325,6 +325,11 @@ mv-core.teleportfailurereason.teleport.failed=Что-то отклонило т
 mv-core.teleportfailurereason.teleport.failed.exception=Произошла ошибка во время телепортации. См. консоль для подробностей.
 mv-core.teleportfailurereason.event.cancelled=Телепортация была отменена другим плагином.
 
+# alias name conflict
+mv-core.aliasnameconflict.detected=Обнаружен конфликт псевдонима для мира '{world}' с псевдонимом '{alias}'. Это может затруднить понимание списка миров и их выбор!
+mv-core.aliasnameconflict.duplicatealias= - Конфликтует с псевдонимом мира '{world}': '{alias}'
+mv-core.aliasnameconflict.duplicateworldname= - Конфликтует с названием мира: '{world}'
+
 # world manager result
 mv-core.cloneworld.invalidworldname=Мир '{world}' содержит недопустимые символы!
 mv-core.cloneworld.worldexistfolder=Мир '{world}' существует в папках сервера! Вам нужно удалить его перед клонированием.

src/main/resources/multiverse-core_tr.properties

@@ -32,7 +32,7 @@ mv-core.check.location=Hedefin konumu: &f{location}
 # /mv clone
 mv-core.clone.description=Bir dünyayı kopyalar.
 mv-core.clone.world.description=Kopyalanacak hedef dünya.
-mv-core.clone.newWorld.description=Yeni kopyalanan dünyanın adı.
+mv-core.clone.newworld.description=Yeni kopyalanan dünyanın adı.
 mv-core.clone.cloning='{world}' dünyası '{newworld}' olarak kopyalanıyor...
 mv-core.clone.success=&aDünya '{world}' olarak kopyalandı!
 
@@ -53,7 +53,7 @@ mv-core.coordinates.description=Koordinatlarınızı gösterir
 mv-core.coordinates.info.title=&b--- Konum Bilgisi ---
 mv-core.coordinates.info.world=&bDünya: &f{world}
 mv-core.coordinates.info.alias=&bTakma Ad: &f{alias}
-mv-core.coordinates.info.worldScale=&bDünya Ölçeği: &f{scale}
+mv-core.coordinates.info.worldscale=&bDünya Ölçeği: &f{scale}
 mv-core.coordinates.info.coordinates=&bKoordinatlar: &f{coordinates}
 mv-core.coordinates.info.direction=&bYön: &f{direction}
 
@@ -356,6 +356,11 @@ mv-core.teleportfailurereason.teleport.failed=Işınlama reddedildi. Başka bir
 mv-core.teleportfailurereason.teleport.failed.exception=Işınlama sırasında bir hata oluştu. Daha fazla ayrıntı için sunucu günlüklerini kontrol edin.
 mv-core.teleportfailurereason.event.cancelled=Işınlama başka bir eklenti tarafından iptal edildi.
 
+# alias name conflict
+mv-core.aliasnameconflict.detected='{alias}' takma adına sahip '{world}' dünyası için takma ad çakışması algılandı. Bu, dünya listesini ve seçimini kafa karıştırıcı hale getirebilir!
+mv-core.aliasnameconflict.duplicatealias= - '{world}' dünyasının takma adıyla çakışıyor: '{alias}'
+mv-core.aliasnameconflict.duplicateworldname= - Dünya adıyla çakışıyor: '{world}'
+
 # world manager result
 mv-core.cloneworld.invalidworldname='{world}' dünyası geçersiz karakterler içeriyor!
 mv-core.cloneworld.worldexistfolder='{world}' dünyası sunucu klasörlerinde mevcut! Kopyalamadan önce silmeniz gerekiyor.
@@ -379,14 +384,14 @@ mv-core.importworld.worldexistunloaded='{world}' dünyası zaten mevcut, ancak y
 mv-core.importworld.worldexistloaded='{world}' dünyası zaten mevcut!
 mv-core.importworld.worldfolderinvalid='{world}' dünya klasörünün içeriği geçerli bir dünya gibi görünmüyor! Doğru veri ve bölge klasörleri içerdiğinden emin olun.\n&cSunucu yazılımı dünya klasörleriyle farklı bir şey yapıyorsa veya dünyanın geçerli olduğundan çok eminseniz, '&3--skip-folder-check&c' bayrağını kullanın.
 mv-core.importworld.bukkitenvironmentmismatch=Ortam uyuşmazlığı tespit edildi!&f '{world}' dünyası '{bukkitEnvironment}' ortamıyla zaten yüklü, ancak Multiverse onu '{mvEnvironment}' ortamıyla içe aktarmaya çalışıyor.
-mv-core.importworld.bukkitnamespacemismatch=Ad alanı uyuşmazlığı tespit edildi!&f '{world}' dünyası '{bukkitNamespace}' ad alanıyla zaten yüklü, ancak Multiverse onu '{mvNamespace}' ad alanıyla içe aktarmaya çalışıyor.
+mv-core.importworld.bukkitnamespacedkeymismatch=Ad alanı uyuşmazlığı tespit edildi!&f '{world}' dünyası '{bukkitNamespace}' ad alanıyla zaten yüklü, ancak Multiverse onu '{mvNamespace}' ad alanıyla içe aktarmaya çalışıyor.
 
 mv-core.loadworld.worldalreadyloading='{world}' dünyası zaten yükleniyor! Lütfen bekleyin...
 mv-core.loadworld.worldnonexistent='{world}' dünyası bulunamadı! Oluşturmak için '&a/mv create {world} <ortam>&f' kullanın.
 mv-core.loadworld.worldexistfolder='{world}' dünyası sunucu klasörlerinde mevcut, ancak Multiverse tarafından bilinmiyor!&f İçe aktarmak istiyorsanız '&a/mv import {world} <ortam>&f' yazın.
 mv-core.loadworld.worldexistloaded='{world}' dünyası zaten yüklü!
 mv-core.loadworld.bukkitenvironmentmismatch=Ortam uyuşmazlığı tespit edildi!&f '{world}' dünyası '{bukkitEnvironment}' ortamıyla zaten yüklü, ancak Multiverse onu '{mvEnvironment}' ortamıyla yüklemeye çalışıyor.
-mv-core.loadworld.bukkitnamespacemismatch=Ad alanı uyuşmazlığı tespit edildi!&f '{world}' dünyası '{bukkitNamespace}' ad alanıyla zaten yüklü, ancak Multiverse onu '{mvNamespace}' ad alanıyla yüklemeye çalışıyor.
+mv-core.loadworld.bukkitnamespacedkeymismatch=Ad alanı uyuşmazlığı tespit edildi!&f '{world}' dünyası '{bukkitNamespace}' ad alanıyla zaten yüklü, ancak Multiverse onu '{mvNamespace}' ad alanıyla yüklemeye çalışıyor.
 
 mv-core.removeworld.worldnonexistent='{world}' dünyası bulunamadı!
 
@@ -441,4 +446,4 @@ mv-core.generic.error.details=Hata: {error}
 mv-core.generic.null=Null!
 mv-core.generic.you=sen
 mv-core.generic.playercount={count} oyuncu
-mv-core.generic.teleportplayers.failed=Bir veya daha fazla oyuncu dünyadan ışınlanamadı!
+mv-core.generic.teleportplayers.failed=Bir veya daha fazla oyuncu dünyadan ışınlanamadı!

src/main/resources/multiverse-core_zh.properties

@@ -32,7 +32,7 @@ mv-core.check.location=目标的地址是： &f{location}
 # /mv clone
 mv-core.clone.description=复制一个世界。
 mv-core.clone.world.description=需要复制的原世界。
-mv-core.clone.newWorld.description=新世界的名称。
+mv-core.clone.newworld.description=新世界的名称。
 mv-core.clone.cloning=正在复制 '{world}' 到 '{newworld}'……
 mv-core.clone.success=&a已将世界复制到 '{world}'！
 
@@ -53,7 +53,7 @@ mv-core.coordinates.description=直接发送你的坐标
 mv-core.coordinates.info.title=&b--- 位置信息 ---
 mv-core.coordinates.info.world=&b世界： &f{world}
 mv-core.coordinates.info.alias=&b别名： &f{alias}
-mv-core.coordinates.info.worldScale=&b世界比例： &f{scale}
+mv-core.coordinates.info.worldscale=&b世界比例： &f{scale}
 mv-core.coordinates.info.coordinates=&b坐标： &f{coordinates}
 mv-core.coordinates.info.direction=&b方向： &f{direction}
 
@@ -331,6 +331,11 @@ mv-core.teleportfailurereason.teleport.failed=传送被拒绝。请确保其他
 mv-core.teleportfailurereason.teleport.failed.exception=在传送过程中出现了一个错误。查看服务器日志获取更多信息。
 mv-core.teleportfailurereason.event.cancelled=传送被另一个插件取消了。
 
+# alias name conflict
+mv-core.aliasnameconflict.detected=检测到世界 '{world}' 的别名 '{alias}' 存在冲突。这可能会让世界列表和选择变得混乱！
+mv-core.aliasnameconflict.duplicatealias= - 与世界 '{world}' 的别名冲突：'{alias}'
+mv-core.aliasnameconflict.duplicateworldname= - 与世界名称冲突：'{world}'
+
 # world manager result
 mv-core.cloneworld.invalidworldname=世界 '{world}' 包含无效的字符！
 mv-core.cloneworld.worldexistfolder=世界 '{world}' 已经存在于服务器的文件中！在复制前你需要先删除它。

src/test/java/org/mvplugins/multiverse/core/command/LocalizationTest.kt

@@ -18,6 +18,7 @@ import org.mvplugins.multiverse.core.locale.PluginLocales
 import org.mvplugins.multiverse.core.locale.message.Message
 import org.mvplugins.multiverse.core.locale.message.MessageReplacement.replace
 import java.util.Locale
+import java.util.Properties
 import kotlin.test.*
 
 class LocalizationTest : TestWithMockBukkit() {
@@ -31,6 +32,18 @@ class LocalizationTest : TestWithMockBukkit() {
         locales = commandManager.locales
     }
 
+    @Test
+    fun `Default locale bundle contains every message key`() {
+        val properties = Properties()
+        assertNotNull(javaClass.getResourceAsStream("/multiverse-core_en.properties")).use {
+            properties.load(it)
+        }
+
+        MVCorei18n.entries.forEach { message ->
+            assertTrue(properties.containsKey(message.messageKey.key), "Missing locale key: ${message.messageKey.key}")
+        }
+    }
+
     @Nested
     @DisplayName("Given a Message with only a non-localized message")
     inner class BasicMessage {
@@ -45,7 +58,7 @@ class LocalizationTest : TestWithMockBukkit() {
 
         @Test
         fun `The formatted message should be the same as the original`() {
-            assertEquals(messageString, message.formatted())
+            assertEquals(messageString, message.rawFormatted())
         }
 
         @Test
@@ -97,7 +110,7 @@ class LocalizationTest : TestWithMockBukkit() {
 
         @Test
         fun `The formatted message should be the replaced message string`() {
-            assertEquals(replacedMessageString, message.formatted())
+            assertEquals(replacedMessageString, message.rawFormatted())
         }
 
         @Test
@@ -156,7 +169,7 @@ class LocalizationTest : TestWithMockBukkit() {
 
         @Test
         fun `The formatted message should be the replaced message string`() {
-            assertEquals(replacedMessageString, message.formatted())
+            assertEquals(replacedMessageString, message.rawFormatted())
         }
 
         @Test
@@ -209,8 +222,13 @@ class LocalizationTest : TestWithMockBukkit() {
         }
 
         @Test
-        fun `The formatted message should be the replaced original string`() {
-            assertEquals(replacedMessageString, message.formatted())
+        fun `The raw formatted message should be the replaced original string`() {
+            assertEquals(replacedMessageString, message.rawFormatted())
+        }
+
+        @Test
+        fun `The formatted message should be different from the replaced original string`() {
+            assertNotEquals(replacedMessageString, message.formatted())
         }
 
         @Test
@@ -271,7 +289,7 @@ class LocalizationTest : TestWithMockBukkit() {
 
         @Test
         fun `The formatted message should be the replaced original string`() {
-            assertEquals(replacedMessageString, message.formatted())
+            assertEquals(replacedMessageString, message.rawFormatted())
         }
 
         @Test

src/test/java/org/mvplugins/multiverse/core/world/WorldManagerTest.kt

@@ -49,6 +49,48 @@ class WorldManagerTest : TestWithMockBukkit() {
         assertNotNull(world2)
     }
 
+    @Test
+    fun `World reference follows unload and reload`() {
+        val ref = world2.asRef()
+        assertSame(world2, ref.get().get())
+        assertSame(world2, ref.getLoaded().get())
+
+        assertTrue(worldManager.unloadWorld(UnloadWorldOptions.world(world2)).isSuccess)
+        assertTrue(ref.getLoaded().isEmpty)
+        val unloaded = ref.get().get()
+        assertFalse(unloaded.isLoaded)
+        assertSame(worldManager.getWorld(world2.name).get(), unloaded)
+
+        val unloadedRef = unloaded.asRef()
+        assertTrue(worldManager.loadWorld(LoadWorldOptions.world(unloaded)).isSuccess)
+        val reloaded = worldManager.getLoadedWorld(world2.name).get()
+        assertNotSame(world2, reloaded)
+        assertSame(reloaded, ref.get().get())
+        assertSame(reloaded, ref.getLoaded().get())
+        assertSame(reloaded, unloadedRef.getLoaded().get())
+    }
+
+    @Test
+    fun `World reference follows regeneration`() {
+        val ref = world2.asRef()
+        assertTrue(worldManager.regenWorld(RegenWorldOptions.world(world2).seed(4321L)).isSuccess)
+
+        val regenerated = ref.getLoaded().get()
+        assertNotSame(world2, regenerated)
+        assertSame(worldManager.getLoadedWorld(world2.name).get(), regenerated)
+        assertSame(regenerated, ref.get().get())
+        assertEquals(4321L, regenerated.seed)
+    }
+
+    @Test
+    fun `World reference is empty after removal`() {
+        val ref = world2.asRef()
+        assertTrue(worldManager.removeWorld(RemoveWorldOptions.world(world2)).isSuccess)
+
+        assertTrue(ref.get().isEmpty)
+        assertTrue(ref.getLoaded().isEmpty)
+    }
+
     @Test
     fun `Create world with custom options`() {
         assertTrue(worldManager.createWorld(

src/test/java/org/mvplugins/multiverse/core/world/helper/AliasNameConflictCheckerTest.kt

@@ -0,0 +1,50 @@
+package org.mvplugins.multiverse.core.world.helper
+
+import org.mvplugins.multiverse.core.TestWithMockBukkit
+import org.mvplugins.multiverse.core.world.LoadedMultiverseWorld
+import org.mvplugins.multiverse.core.world.WorldManager
+import org.mvplugins.multiverse.core.world.helpers.AliasNameConflictChecker
+import org.mvplugins.multiverse.core.world.options.CreateWorldOptions
+import kotlin.test.BeforeTest
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+class AliasNameConflictCheckerTest : TestWithMockBukkit() {
+
+    private lateinit var conflictChecker: AliasNameConflictChecker
+    private lateinit var firstWorld: LoadedMultiverseWorld
+    private lateinit var secondWorld: LoadedMultiverseWorld
+
+    @BeforeTest
+    fun setUp() {
+        val worldManager = requireNotNull(serviceLocator.getActiveService(WorldManager::class.java))
+        conflictChecker = requireNotNull(serviceLocator.getService(AliasNameConflictChecker::class.java))
+
+        assertTrue(worldManager.createWorld(CreateWorldOptions.worldName("FirstWorld")).isSuccess)
+        assertTrue(worldManager.createWorld(CreateWorldOptions.worldName("SecondWorld")).isSuccess)
+        firstWorld = worldManager.getLoadedWorld("FirstWorld").get()
+        secondWorld = worldManager.getLoadedWorld("SecondWorld").get()
+    }
+
+    @Test
+    fun `Aliases differing only by case conflict`() {
+        assertTrue(firstWorld.setAlias("SharedAlias").isSuccess)
+        assertTrue(secondWorld.setAlias("sharedalias").isSuccess)
+
+        val result = conflictChecker.checkDuplicateFor(secondWorld)
+
+        assertEquals(listOf(firstWorld), result.duplicateAliases)
+        assertTrue(result.duplicateWorldNames.isEmpty())
+    }
+
+    @Test
+    fun `Alias and world name differing only by case conflict`() {
+        assertTrue(firstWorld.setAlias("SECONDWORLD").isSuccess)
+
+        val result = conflictChecker.checkDuplicateFor(firstWorld)
+
+        assertTrue(result.duplicateAliases.isEmpty())
+        assertEquals(listOf(secondWorld), result.duplicateWorldNames)
+    }
+}

src/test/resources/configs/fresh_config.yml

@@ -11,6 +11,7 @@ world:
   world-name-format:
     nether: '%overworld%_nether'
     end: '%overworld%_the_end'
+  warn-alias-conflicts: true
 
 teleport:
   use-finer-teleport-permissions: true