diff --git a/.github/labeler.yml b/.github/labeler.yml
new file mode 100644
index 00000000..0de407b5
--- /dev/null
+++ b/.github/labeler.yml
@@ -0,0 +1,2 @@
+prerelease:
+  - '*'
diff --git a/.github/workflows/pr_labeler.yml b/.github/workflows/pr_labeler.yml
new file mode 100644
index 00000000..69387def
--- /dev/null
+++ b/.github/workflows/pr_labeler.yml
@@ -0,0 +1,17 @@
+name: "Pull Request Labeler"
+
+on:
+  pull_request_target:
+    types: [opened]
+    branches: [main]
+
+jobs:
+  prerelease_labeler:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@v4
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"
diff --git a/.github/workflows/promote_release.yml b/.github/workflows/promote_release.yml
new file mode 100644
index 00000000..5ee77d1d
--- /dev/null
+++ b/.github/workflows/promote_release.yml
@@ -0,0 +1,90 @@
+name: Manually promote last prerelease to release
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version to promote'
+        required: true
+      version-bump:
+        description: 'Version bump to apply - should usually match the version bump used for the prerelease since last release'
+        required: true
+        type: choice
+        options:
+          - 'patch'
+          - 'minor'
+          - 'major'
+
+jobs:
+  manually_promote_release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Verify input version is prerelease
+        run: |
+          if [[ "${{ github.event.inputs.version }}" != *"pre"* ]]; then
+              echo "Version must be a prerelease"
+              exit 1
+          fi
+
+      - name: Get release info
+        id: get-release
+        uses: cardinalby/git-get-release-action@v1
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        with:
+          tag: ${{ github.event.inputs.version }}
+
+      - uses: actions/checkout@v3
+        with:
+          ref: ${{ steps.get-release.outputs.tag_name }}
+
+      - uses: actions/setup-java@v3
+        with:
+          java-version: '11'
+          distribution: 'adopt'
+          cache: gradle
+
+      - name: Validate Gradle wrapper
+        uses: gradle/wrapper-validation-action@v1
+
+      - name: Remove prerelease tag
+        run: |
+          echo "Removing prerelease tag from version"
+          echo "VERSION=$(echo ${{ steps.get-release.outputs.tag_name }} | sed -E 's/-pre.*//')" >> $GITHUB_ENV
+
+      - name: Build
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: clean build -x test -x checkstyleMain -x checkstyleTest
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_VERSION: ${{ env.VERSION }}
+
+      - name: Create release
+        id: release
+        uses: Multiverse/release-on-push-action@skip_prs
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          bump_version_scheme: ${{ github.event.inputs.version-bump }}
+          tag_prefix: ''
+          release_name: "<RELEASE_VERSION>"
+          use_github_release_notes: true
+          ref: ${{ steps.get-release.outputs.target_commitish }}
+          skip_prs: true
+
+      - name: Publish package
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: publish
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_VERSION: ${{ env.VERSION }}
+
+      - name: Upload release artifact
+        uses: svenstaro/upload-release-action@v2
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          file: build/libs/multiverse-core-${{ env.VERSION }}.jar
+          asset_name: multiverse-core-${{ steps.release.outputs.tag_name }}.jar
+          tag: ${{ steps.release.outputs.tag_name }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 738878dc..5cecab08 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -28,27 +28,37 @@ jobs:
 
       - name: Create release
         id: release
-        uses: rymndhng/release-on-push-action@v0.27.0
+        uses: Multiverse/release-on-push-action@support_prerelease
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           bump_version_scheme: norelease
           tag_prefix: ''
-          release_name: "Release <RELEASE_VERSION>"
+          release_name: "<RELEASE_VERSION>"
           use_github_release_notes: true
 
+      - name: Modify version scheme
+        run: |
+            if [[ "${{ steps.release.outputs.tag_name }}" == *"pre"* ]]; then
+                echo "Replacing prerelease version scheme with SNAPSHOT"
+                echo "VERSION=$(echo ${{ steps.release.outputs.tag_name }} | sed -E 's/-pre.*/-SNAPSHOT/')" >> $GITHUB_ENV
+            else
+                echo "Using release version scheme"
+                echo "VERSION=${{ steps.release.outputs.tag_name }}" >> $GITHUB_ENV
+            fi
+
       - name: Publish package
         uses: gradle/gradle-build-action@v2
         with:
           arguments: publish
         env:
-          GITHUB_VERSION: ${{ steps.release.outputs.tag_name }}
+          GITHUB_VERSION: ${{ env.VERSION }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Upload release artifact
         uses: svenstaro/upload-release-action@v2
         with:
           repo_token: ${{ secrets.GITHUB_TOKEN }}
-          file: build/libs/multiverse-core-${{ steps.release.outputs.tag_name }}.jar
+          file: build/libs/multiverse-core-${{ env.VERSION }}.jar
           asset_name: multiverse-core-${{ steps.release.outputs.tag_name }}.jar
           tag: ${{ steps.release.outputs.tag_name }}
diff --git a/.github/workflows/require_label.yml b/.github/workflows/require_label.yml
index e4f9c293..13922340 100644
--- a/.github/workflows/require_label.yml
+++ b/.github/workflows/require_label.yml
@@ -15,4 +15,4 @@ jobs:
         with:
           mode: exactly
           count: 1
-          labels: "release:major, release:minor, release:patch, no release"
+          labels: "release:major, release:minor, release:patch, no version bump"
diff --git a/build.gradle b/build.gradle
index 9a0a0d61..98d22ad0 100644
--- a/build.gradle
+++ b/build.gradle
@@ -5,16 +5,23 @@ plugins {
     id 'maven-publish'
     id 'checkstyle'
     id 'com.github.johnrengelman.shadow' version '7.1.2'
+    id "org.jetbrains.kotlin.jvm" version "1.8.10"
 }
 
 version = System.getenv('GITHUB_VERSION') ?: 'local'
 group = 'com.onarandombox.multiversecore'
 description = 'Multiverse-Core'
 
-java.sourceCompatibility = JavaVersion.VERSION_11
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(17))
+    }
+}
 
 repositories {
     mavenLocal()
+    mavenCentral()
+
     maven {
         url = uri('https://hub.spigotmc.org/nexus/content/repositories/snapshots/')
     }
@@ -50,11 +57,13 @@ repositories {
     }
 }
 
+configurations {
+    oldTestImplementation.extendsFrom implementation
+    oldTestRuntime.extendsFrom runtime
+}
+
 dependencies {
-    // Spigot
-    implementation('org.spigotmc:spigot-api:1.16.5-R0.1-SNAPSHOT') {
-        exclude group: 'junit', module: 'junit'
-    }
+    compileOnly 'org.spigotmc:spigot-api:1.16.5-R0.1-SNAPSHOT'
 
     // Economy
     implementation('com.github.MilkBowl:VaultAPI:1.7.1') {
@@ -82,9 +91,21 @@ dependencies {
     api 'org.jetbrains:annotations:22.0.0'
 
     // Tests
-    testImplementation 'junit:junit:4.13.1'
-    testImplementation 'org.mockito:mockito-core:3.11.2'
-    testImplementation 'commons-io:commons-io:2.7'
+    testImplementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.10'
+    testImplementation 'com.github.seeseemelk:MockBukkit-v1.19:2.141.0'
+    testImplementation('com.googlecode.json-simple:json-simple:1.1.1') {
+        exclude group: 'junit', module: 'junit'
+    }
+    testImplementation 'org.jetbrains.kotlin:kotlin-test'
+
+    // Old Tests
+    oldTestImplementation 'org.spigotmc:spigot-api:1.19.3-R0.1-SNAPSHOT'
+    oldTestImplementation('com.googlecode.json-simple:json-simple:1.1.1') {
+        exclude group: 'junit', module: 'junit'
+    }
+    oldTestImplementation 'junit:junit:4.13.1'
+    oldTestImplementation 'org.mockito:mockito-core:3.11.2'
+    oldTestImplementation 'commons-io:commons-io:2.7'
 }
 
 
@@ -109,6 +130,19 @@ configurations {
     }
 }
 
+
+sourceSets {
+    oldTest {
+        java {
+            compileClasspath += main.output
+            runtimeClasspath += main.output
+            srcDir file('src/old-test/java')
+        }
+        resources.srcDir file('src/old-test/resources')
+    }
+}
+
+
 publishing {
     publications {
         maven(MavenPublication) {
@@ -143,6 +177,19 @@ compileJava {
     source = prepareSource.outputs
 }
 
+compileKotlin {
+    // We're not using Kotlin in the plugin itself, just tests!
+    enabled = false
+}
+configurations {
+    compileOnly {
+        exclude group: 'org.jetbrains.kotlin', module: 'kotlin-stdlib-jdk8'
+    }
+    runtimeOnly {
+        exclude group: 'org.jetbrains.kotlin', module: 'kotlin-stdlib-jdk8'
+    }
+}
+
 processResources {
     def props = [version: "${project.version}"]
     inputs.properties props
@@ -184,14 +231,17 @@ shadowJar {
     configurations = [project.configurations.api]
 
     archiveFileName = "$baseName-$version.$extension"
+
+    dependencies {
+        exclude(dependency {
+            it.moduleGroup == 'org.jetbrains.kotlin'
+        })
+    }
 }
 
 build.dependsOn shadowJar
 jar.enabled = false
 
-
-// Excludes all test
-// TODO: Remove this when we have tests for MV5
 test {
-    exclude '**/*'
+    useJUnitPlatform()
 }
diff --git a/src/main/java/com/onarandombox/MultiverseCore/MultiverseCore.java b/src/main/java/com/onarandombox/MultiverseCore/MultiverseCore.java
index 2cb1f014..d6887db5 100644
--- a/src/main/java/com/onarandombox/MultiverseCore/MultiverseCore.java
+++ b/src/main/java/com/onarandombox/MultiverseCore/MultiverseCore.java
@@ -168,6 +168,7 @@ public class MultiverseCore extends JavaPlugin implements MVCore {
         this.anchorManager.loadAnchors();
         this.registerEvents();
         this.registerCommands();
+        this.setUpLocales();
         this.registerDestinations();
         this.setupMetrics();
         this.saveMVConfig();
@@ -220,6 +221,15 @@ public class MultiverseCore extends JavaPlugin implements MVCore {
         this.commandManager.registerCommand(new UnloadCommand(this));
     }
 
+    /**
+     * Register locales
+     */
+    private void setUpLocales() {
+        this.commandManager.usePerIssuerLocale(true, true);
+        this.commandManager.getLocales().addFileResClassLoader(this);
+        this.commandManager.getLocales().addMessageBundles("multiverse-core");
+    }
+
     /**
      * Register all the destinations.
      */
diff --git a/src/test/java/com/onarandombox/MultiverseCore/TestDebugMode.java b/src/old-test/java/com/onarandombox/MultiverseCore/TestDebugMode.java
similarity index 100%
rename from src/test/java/com/onarandombox/MultiverseCore/TestDebugMode.java
rename to src/old-test/java/com/onarandombox/MultiverseCore/TestDebugMode.java
diff --git a/src/test/java/com/onarandombox/MultiverseCore/TestEntitySpawnRules.java b/src/old-test/java/com/onarandombox/MultiverseCore/TestEntitySpawnRules.java
similarity index 100%
rename from src/test/java/com/onarandombox/MultiverseCore/TestEntitySpawnRules.java
rename to src/old-test/java/com/onarandombox/MultiverseCore/TestEntitySpawnRules.java
diff --git a/src/test/java/com/onarandombox/MultiverseCore/TestEntryFeeConversion.java b/src/old-test/java/com/onarandombox/MultiverseCore/TestEntryFeeConversion.java
similarity index 100%
rename from src/test/java/com/onarandombox/MultiverseCore/TestEntryFeeConversion.java
rename to src/old-test/java/com/onarandombox/MultiverseCore/TestEntryFeeConversion.java
diff --git a/src/test/java/com/onarandombox/MultiverseCore/TestModifyCommand.java b/src/old-test/java/com/onarandombox/MultiverseCore/TestModifyCommand.java
similarity index 100%
rename from src/test/java/com/onarandombox/MultiverseCore/TestModifyCommand.java
rename to src/old-test/java/com/onarandombox/MultiverseCore/TestModifyCommand.java
diff --git a/src/test/java/com/onarandombox/MultiverseCore/TestWorldProperties.java b/src/old-test/java/com/onarandombox/MultiverseCore/TestWorldProperties.java
similarity index 100%
rename from src/test/java/com/onarandombox/MultiverseCore/TestWorldProperties.java
rename to src/old-test/java/com/onarandombox/MultiverseCore/TestWorldProperties.java
diff --git a/src/test/java/com/onarandombox/MultiverseCore/TestWorldPurger.java b/src/old-test/java/com/onarandombox/MultiverseCore/TestWorldPurger.java
similarity index 100%
rename from src/test/java/com/onarandombox/MultiverseCore/TestWorldPurger.java
rename to src/old-test/java/com/onarandombox/MultiverseCore/TestWorldPurger.java
diff --git a/src/test/java/com/onarandombox/MultiverseCore/TestWorldStuff.java b/src/old-test/java/com/onarandombox/MultiverseCore/TestWorldStuff.java
similarity index 100%
rename from src/test/java/com/onarandombox/MultiverseCore/TestWorldStuff.java
rename to src/old-test/java/com/onarandombox/MultiverseCore/TestWorldStuff.java
diff --git a/src/test/java/com/onarandombox/MultiverseCore/utils/FileUtilsTest.java b/src/old-test/java/com/onarandombox/MultiverseCore/utils/FileUtilsTest.java
similarity index 100%
rename from src/test/java/com/onarandombox/MultiverseCore/utils/FileUtilsTest.java
rename to src/old-test/java/com/onarandombox/MultiverseCore/utils/FileUtilsTest.java
diff --git a/src/test/java/com/onarandombox/MultiverseCore/utils/MVTestLogFormatter.java b/src/old-test/java/com/onarandombox/MultiverseCore/utils/MVTestLogFormatter.java
similarity index 100%
rename from src/test/java/com/onarandombox/MultiverseCore/utils/MVTestLogFormatter.java
rename to src/old-test/java/com/onarandombox/MultiverseCore/utils/MVTestLogFormatter.java
diff --git a/src/test/java/com/onarandombox/MultiverseCore/utils/MockWorldFactory.java b/src/old-test/java/com/onarandombox/MultiverseCore/utils/MockWorldFactory.java
similarity index 100%
rename from src/test/java/com/onarandombox/MultiverseCore/utils/MockWorldFactory.java
rename to src/old-test/java/com/onarandombox/MultiverseCore/utils/MockWorldFactory.java
diff --git a/src/test/java/com/onarandombox/MultiverseCore/utils/TestInstanceCreator.java b/src/old-test/java/com/onarandombox/MultiverseCore/utils/TestInstanceCreator.java
similarity index 100%
rename from src/test/java/com/onarandombox/MultiverseCore/utils/TestInstanceCreator.java
rename to src/old-test/java/com/onarandombox/MultiverseCore/utils/TestInstanceCreator.java
diff --git a/src/test/java/com/onarandombox/MultiverseCore/utils/Util.java b/src/old-test/java/com/onarandombox/MultiverseCore/utils/Util.java
similarity index 100%
rename from src/test/java/com/onarandombox/MultiverseCore/utils/Util.java
rename to src/old-test/java/com/onarandombox/MultiverseCore/utils/Util.java
diff --git a/src/test/java/com/onarandombox/MultiverseCore/utils/WorldCreatorMatcher.java b/src/old-test/java/com/onarandombox/MultiverseCore/utils/WorldCreatorMatcher.java
similarity index 100%
rename from src/test/java/com/onarandombox/MultiverseCore/utils/WorldCreatorMatcher.java
rename to src/old-test/java/com/onarandombox/MultiverseCore/utils/WorldCreatorMatcher.java
diff --git a/src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker b/src/old-test/resources/mockito-extensions/org.mockito.plugins.MockMaker
similarity index 100%
rename from src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker
rename to src/old-test/resources/mockito-extensions/org.mockito.plugins.MockMaker
diff --git a/src/test/java/org/mvplugins/multiverse/core/MockBukkitTest.kt b/src/test/java/org/mvplugins/multiverse/core/MockBukkitTest.kt
new file mode 100644
index 00000000..894125bf
--- /dev/null
+++ b/src/test/java/org/mvplugins/multiverse/core/MockBukkitTest.kt
@@ -0,0 +1,33 @@
+package org.mvplugins.multiverse.core
+
+import be.seeseemelk.mockbukkit.MockBukkit
+import be.seeseemelk.mockbukkit.ServerMock
+import com.onarandombox.MultiverseCore.MultiverseCore
+import com.onarandombox.MultiverseCore.utils.TestingMode
+import kotlin.test.AfterTest
+import kotlin.test.BeforeTest
+import kotlin.test.Test
+import kotlin.test.assertNotNull
+
+class MockBukkitTest {
+
+    lateinit var server: ServerMock
+    lateinit var plugin: MultiverseCore
+
+    @BeforeTest
+    fun setUp() {
+        TestingMode.enable()
+        server = MockBukkit.mock()
+        plugin = MockBukkit.load(MultiverseCore::class.java)
+    }
+
+    @AfterTest
+    fun tearDown() {
+        MockBukkit.unmock()
+    }
+
+    @Test
+    fun `MockBukkit loads the plugin`() {
+        assertNotNull(plugin)
+    }
+}