diff --git a/api/src/main/kotlin/com/undefined/stellar/manager/CommandManager.kt b/api/src/main/kotlin/com/undefined/stellar/manager/CommandManager.kt
index b1c0b58..ad40b30 100644
--- a/api/src/main/kotlin/com/undefined/stellar/manager/CommandManager.kt
+++ b/api/src/main/kotlin/com/undefined/stellar/manager/CommandManager.kt
@@ -9,6 +9,7 @@ import org.jetbrains.annotations.ApiStatus
 @ApiStatus.Internal
 object CommandManager {
     val registrars: Map<String, AbstractCommandRegistrar> = mapOf(
+        "1.20.4" to com.undefined.stellar.v1_20_4.CommandRegistrar,
         "1.20.5" to com.undefined.stellar.v1_20_6.CommandRegistrar,
         "1.20.6" to com.undefined.stellar.v1_20_6.CommandRegistrar,
         "1.21" to com.undefined.stellar.v1_21.CommandRegistrar,
diff --git a/common/src/main/kotlin/com/undefined/stellar/AbstractStellarCommand.kt b/common/src/main/kotlin/com/undefined/stellar/AbstractStellarCommand.kt
index 048a8ac..0cd6780 100644
--- a/common/src/main/kotlin/com/undefined/stellar/AbstractStellarCommand.kt
+++ b/common/src/main/kotlin/com/undefined/stellar/AbstractStellarCommand.kt
@@ -96,7 +96,7 @@ abstract class AbstractStellarCommand<T>(val name: String, var description: Stri
     }
 
     inline fun <reified C : CommandSender> addRequirement(noinline requirement: C.() -> Boolean): T =
-        addRequirements(StellarRequirement(requirement))
+        addRequirements(StellarRequirement(C::class, requirement))
 
     fun setFailureMessages(messages: List<Component>): T {
         failureMessages.clear()
@@ -158,7 +158,7 @@ abstract class AbstractStellarCommand<T>(val name: String, var description: Stri
         addGlobalFailureMessages(messages.toList())
 
     inline fun <reified C : CommandSender> addFailureExecution(noinline execution: CommandContext<C>.() -> Unit): T {
-        failureExecutions.add(StellarExecution(execution))
+        failureExecutions.add(StellarExecution(C::class, execution))
         return this as T
     }
 
@@ -173,7 +173,7 @@ abstract class AbstractStellarCommand<T>(val name: String, var description: Stri
     }
 
     inline fun <reified C : CommandSender> addExecution(noinline execution: CommandContext<C>.() -> Unit): T {
-        executions.add(StellarExecution(execution))
+        executions.add(StellarExecution(C::class, execution))
         return this as T
     }
 
@@ -183,7 +183,7 @@ abstract class AbstractStellarCommand<T>(val name: String, var description: Stri
     }
 
     inline fun <reified C : CommandSender> addRunnable(noinline runnable: CommandContext<C>.() -> Boolean): T {
-        runnables.add(StellarRunnable(runnable))
+        runnables.add(StellarRunnable(C::class, runnable))
         return this as T
     }
 
diff --git a/common/src/main/kotlin/com/undefined/stellar/argument/AbstractStellarSubCommand.kt b/common/src/main/kotlin/com/undefined/stellar/argument/AbstractStellarSubCommand.kt
index d575357..7f15940 100644
--- a/common/src/main/kotlin/com/undefined/stellar/argument/AbstractStellarSubCommand.kt
+++ b/common/src/main/kotlin/com/undefined/stellar/argument/AbstractStellarSubCommand.kt
@@ -19,56 +19,56 @@ abstract class AbstractStellarArgument<T>(val parent: AbstractStellarCommand<*>,
     }
 
     fun addSuggestion(suggestion: Suggestion): T {
-        suggestions.add(StellarSuggestion<CommandSender> { listOf(suggestion) })
+        suggestions.add(StellarSuggestion(CommandSender::class) { listOf(suggestion) })
         return this as T
     }
 
     fun addSuggestions(list: List<Suggestion>): T {
-        suggestions.add(StellarSuggestion<CommandSender> { list })
+        suggestions.add(StellarSuggestion(CommandSender::class) { list })
         return this as T
     }
 
     fun addSuggestions(vararg list: Suggestion): T {
-        suggestions.add(StellarSuggestion<CommandSender> { list.toList() })
+        suggestions.add(StellarSuggestion(CommandSender::class) { list.toList() })
         return this as T
     }
 
     fun addSuggestionsWithoutTooltip(list: List<String>): T {
-        suggestions.add(StellarSuggestion<CommandSender> { list.map { Suggestion(it, "") } })
+        suggestions.add(StellarSuggestion(CommandSender::class) { list.map { Suggestion(it, "") } })
         return this as T
     }
 
     fun addSuggestions(vararg list: String): T {
-        suggestions.add(StellarSuggestion<CommandSender> { list.map { Suggestion(it, "") } })
+        suggestions.add(StellarSuggestion(CommandSender::class) { list.map { Suggestion(it, "") } })
         return this as T
     }
 
     fun setSuggestions(vararg suggestion: Suggestion): T {
         suggestions.clear()
-        suggestions.add(StellarSuggestion<CommandSender> { suggestion.toList() })
+        suggestions.add(StellarSuggestion(CommandSender::class) { suggestion.toList() })
         return this as T
     }
 
     fun setSuggestions(vararg suggestion: String): T {
         suggestions.clear()
-        suggestions.add(StellarSuggestion<CommandSender> { suggestion.map { Suggestion(it, "") } })
+        suggestions.add(StellarSuggestion(CommandSender::class) { suggestion.map { Suggestion(it, "") } })
         return this as T
     }
 
     fun setSuggestions(suggestion: List<Suggestion>): T {
         suggestions.clear()
-        suggestions.add(StellarSuggestion<CommandSender> { suggestion.toList() })
+        suggestions.add(StellarSuggestion(CommandSender::class) { suggestion.toList() })
         return this as T
     }
 
     fun setSuggestionsWithoutTooltip(suggestion: List<String>): T {
         suggestions.clear()
-        suggestions.add(StellarSuggestion<CommandSender> { suggestion.map { Suggestion(it, "") } })
+        suggestions.add(StellarSuggestion(CommandSender::class) { suggestion.map { Suggestion(it, "") } })
         return this as T
     }
 
     inline fun <reified C : CommandSender> addSuggestion(noinline suggestion: CommandContext<C>.() -> List<Suggestion>): T {
-        suggestions.add(StellarSuggestion(suggestion))
+        suggestions.add(StellarSuggestion(C::class, suggestion))
         return this as T
     }
 
diff --git a/common/src/main/kotlin/com/undefined/stellar/argument/types/custom/CustomArgument.kt b/common/src/main/kotlin/com/undefined/stellar/argument/types/custom/CustomArgument.kt
index c1b13c7..e509e6e 100644
--- a/common/src/main/kotlin/com/undefined/stellar/argument/types/custom/CustomArgument.kt
+++ b/common/src/main/kotlin/com/undefined/stellar/argument/types/custom/CustomArgument.kt
@@ -19,21 +19,21 @@ abstract class CustomArgument<T>(
     override val arguments: MutableList<AbstractStellarArgument<*>>
         get() = (super.arguments + getArgumentsList()).toMutableList()
     override val failureExecutions: MutableList<StellarExecution<*>>
-        get() = (super.failureExecutions + StellarExecution {
+        get() = (super.failureExecutions + StellarExecution(CommandSender::class) {
             failureExecution(this, arguments.values.last())
         }).toMutableList()
     override val requirements: MutableList<StellarRequirement<*>>
-        get() = (super.requirements + StellarRequirement<CommandSender> { requirement() }).toMutableList()
+        get() = (super.requirements + StellarRequirement(CommandSender::class) { requirement() }).toMutableList()
     override val executions: MutableList<StellarExecution<*>>
-        get() = (super.executions + StellarExecution {
+        get() = (super.executions + StellarExecution(CommandSender::class) {
             execution(this, this.arguments.values.last())
         }).toMutableList()
     override val runnables: MutableList<StellarRunnable<*>>
-        get() = (super.runnables + StellarRunnable {
+        get() = (super.runnables + StellarRunnable(CommandSender::class) {
             runnable(this, this[name])
         }).toMutableList()
     override val suggestions: MutableList<StellarSuggestion<*>>
-        get() = (super.suggestions + StellarSuggestion {
+        get() = (super.suggestions + StellarSuggestion(CommandSender::class) {
             listSuggestions(this)
         }).toMutableList()
 
diff --git a/common/src/main/kotlin/com/undefined/stellar/argument/types/primitive/GreedyWordArgument.kt b/common/src/main/kotlin/com/undefined/stellar/argument/types/primitive/GreedyWordArgument.kt
index f7deb98..23cf06f 100644
--- a/common/src/main/kotlin/com/undefined/stellar/argument/types/primitive/GreedyWordArgument.kt
+++ b/common/src/main/kotlin/com/undefined/stellar/argument/types/primitive/GreedyWordArgument.kt
@@ -20,56 +20,56 @@ class GreedyWordArgument {
     }
 
     fun addSuggestion(suggestion: Suggestion): GreedyWordArgument {
-        suggestions.add(GreedyStellarSuggestion<CommandSender> { listOf(suggestion) })
+        suggestions.add(GreedyStellarSuggestion(CommandSender::class) { listOf(suggestion) })
         return this
     }
 
     fun addSuggestions(list: List<Suggestion>): GreedyWordArgument {
-        suggestions.add(GreedyStellarSuggestion<CommandSender> { list })
+        suggestions.add(GreedyStellarSuggestion(CommandSender::class) { list })
         return this
     }
 
     fun addSuggestions(vararg list: Suggestion): GreedyWordArgument {
-        suggestions.add(GreedyStellarSuggestion<CommandSender> { list.toList() })
+        suggestions.add(GreedyStellarSuggestion(CommandSender::class) { list.toList() })
         return this
     }
 
-    fun addSuggestionsWithoutGreedyWordArgumentooltip(list: List<String>): GreedyWordArgument {
-        suggestions.add(GreedyStellarSuggestion<CommandSender> { list.map { Suggestion(it, "") } })
+    fun addSuggestionsWithoutGreedyWordArgumenTooltip(list: List<String>): GreedyWordArgument {
+        suggestions.add(GreedyStellarSuggestion(CommandSender::class) { list.map { Suggestion(it, "") } })
         return this
     }
 
     fun addSuggestions(vararg list: String): GreedyWordArgument {
-        suggestions.add(GreedyStellarSuggestion<CommandSender> { list.map { Suggestion(it, "") } })
+        suggestions.add(GreedyStellarSuggestion(CommandSender::class) { list.map { Suggestion(it, "") } })
         return this
     }
 
     fun setSuggestions(vararg suggestion: Suggestion): GreedyWordArgument {
         suggestions.clear()
-        suggestions.add(GreedyStellarSuggestion<CommandSender> { suggestion.toList() })
+        suggestions.add(GreedyStellarSuggestion(CommandSender::class) { suggestion.toList() })
         return this
     }
 
     fun setSuggestions(vararg suggestion: String): GreedyWordArgument {
         suggestions.clear()
-        suggestions.add(GreedyStellarSuggestion<CommandSender> { suggestion.map { Suggestion(it, "") } })
+        suggestions.add(GreedyStellarSuggestion(CommandSender::class) { suggestion.map { Suggestion(it, "") } })
         return this
     }
 
     fun setSuggestions(suggestion: List<Suggestion>): GreedyWordArgument {
         suggestions.clear()
-        suggestions.add(GreedyStellarSuggestion<CommandSender> { suggestion.toList() })
+        suggestions.add(GreedyStellarSuggestion(CommandSender::class) { suggestion.toList() })
         return this
     }
 
     fun setSuggestionsWithoutTooltip(suggestion: List<String>): GreedyWordArgument {
         suggestions.clear()
-        suggestions.add(GreedyStellarSuggestion<CommandSender> { suggestion.map { Suggestion(it, "") } })
+        suggestions.add(GreedyStellarSuggestion(CommandSender::class) { suggestion.map { Suggestion(it, "") } })
         return this
     }
 
     inline fun <reified C : CommandSender> addSuggestion(noinline suggestion: GreedyCommandContext<C>.() -> List<Suggestion>): GreedyWordArgument {
-        suggestions.add(GreedyStellarSuggestion(suggestion))
+        suggestions.add(GreedyStellarSuggestion(C::class, suggestion))
         return this
     }
 
@@ -79,7 +79,7 @@ class GreedyWordArgument {
     }
 
     inline fun <reified C : CommandSender> addExecution(noinline execution: GreedyCommandContext<C>.() -> Unit): GreedyWordArgument {
-        executions.add(GreedyStellarExecution(execution))
+        executions.add(GreedyStellarExecution(C::class, execution))
         return this
     }
 
@@ -89,7 +89,7 @@ class GreedyWordArgument {
     }
 
     inline fun <reified C : CommandSender> addRunnable(noinline runnable: GreedyCommandContext<C>.() -> Boolean): GreedyWordArgument {
-        runnables.add(GreedyStellarRunnable(runnable))
+        runnables.add(GreedyStellarRunnable(C::class, runnable))
         return this
     }
 
diff --git a/common/src/main/kotlin/com/undefined/stellar/data/argument/GreedyCommandContext.kt b/common/src/main/kotlin/com/undefined/stellar/data/argument/GreedyCommandContext.kt
index e4516b9..509cc1a 100644
--- a/common/src/main/kotlin/com/undefined/stellar/data/argument/GreedyCommandContext.kt
+++ b/common/src/main/kotlin/com/undefined/stellar/data/argument/GreedyCommandContext.kt
@@ -5,7 +5,7 @@ import org.bukkit.command.CommandSender
 typealias GreedyCommandNode = List<String>
 
 @Suppress("UNCHECKED_CAST", "UNUSED")
-class GreedyCommandContext<T : CommandSender>(val arguments: GreedyCommandNode, val source: T, val input: String) {
+class GreedyCommandContext<T : CommandSender>(val arguments: GreedyCommandNode, val sender: T, val input: String) {
     fun getArgument(index: Int): String = arguments[index]
     operator fun get(index: Int) = arguments[index]
 }
\ No newline at end of file
diff --git a/common/src/main/kotlin/com/undefined/stellar/data/execution/GreedyStellarExecution.kt b/common/src/main/kotlin/com/undefined/stellar/data/execution/GreedyStellarExecution.kt
index 684e66f..b82f144 100644
--- a/common/src/main/kotlin/com/undefined/stellar/data/execution/GreedyStellarExecution.kt
+++ b/common/src/main/kotlin/com/undefined/stellar/data/execution/GreedyStellarExecution.kt
@@ -2,10 +2,13 @@ package com.undefined.stellar.data.execution
 
 import com.undefined.stellar.data.argument.GreedyCommandContext
 import org.bukkit.command.CommandSender
+import kotlin.reflect.KClass
+import kotlin.reflect.safeCast
 
 @Suppress("UNCHECKED_CAST")
-data class GreedyStellarExecution<T : CommandSender>(val execution: GreedyCommandContext<T>.() -> Unit) {
+data class GreedyStellarExecution<C : CommandSender>(val clazz: KClass<C>, val execution: GreedyCommandContext<C>.() -> Unit) {
     operator fun invoke(context: GreedyCommandContext<CommandSender>) {
-        execution(context as? GreedyCommandContext<T> ?: return)
+        if (clazz.safeCast(context.sender) == null) return
+        execution(context as GreedyCommandContext<C>)
     }
 }
\ No newline at end of file
diff --git a/common/src/main/kotlin/com/undefined/stellar/data/execution/GreedyStellarRunnable.kt b/common/src/main/kotlin/com/undefined/stellar/data/execution/GreedyStellarRunnable.kt
index 8c0b700..e09a919 100644
--- a/common/src/main/kotlin/com/undefined/stellar/data/execution/GreedyStellarRunnable.kt
+++ b/common/src/main/kotlin/com/undefined/stellar/data/execution/GreedyStellarRunnable.kt
@@ -2,10 +2,13 @@ package com.undefined.stellar.data.execution
 
 import com.undefined.stellar.data.argument.GreedyCommandContext
 import org.bukkit.command.CommandSender
+import kotlin.reflect.KClass
+import kotlin.reflect.safeCast
 
 @Suppress("UNCHECKED_CAST")
-data class GreedyStellarRunnable<C : CommandSender>(val execution: GreedyCommandContext<C>.() -> Boolean) {
+data class GreedyStellarRunnable<C : CommandSender>(val clazz: KClass<C>, val execution: GreedyCommandContext<C>.() -> Boolean) {
     operator fun invoke(context: GreedyCommandContext<CommandSender>): Boolean {
-        return execution(context as? GreedyCommandContext<C> ?: return true)
+        if (clazz.safeCast(context.sender) == null) return true
+        return execution(context as GreedyCommandContext<C>)
     }
 }
\ No newline at end of file
diff --git a/common/src/main/kotlin/com/undefined/stellar/data/execution/StellarExecution.kt b/common/src/main/kotlin/com/undefined/stellar/data/execution/StellarExecution.kt
index 4017af1..1e83f5b 100644
--- a/common/src/main/kotlin/com/undefined/stellar/data/execution/StellarExecution.kt
+++ b/common/src/main/kotlin/com/undefined/stellar/data/execution/StellarExecution.kt
@@ -2,10 +2,13 @@ package com.undefined.stellar.data.execution
 
 import com.undefined.stellar.data.argument.CommandContext
 import org.bukkit.command.CommandSender
+import kotlin.reflect.KClass
+import kotlin.reflect.safeCast
 
 @Suppress("UNCHECKED_CAST")
-data class StellarExecution<T : CommandSender>(val execution: CommandContext<T>.() -> Unit) {
+data class StellarExecution<C : CommandSender>(val clazz: KClass<C>, val execution: CommandContext<C>.() -> Unit) {
     operator fun invoke(context: CommandContext<CommandSender>) {
-        execution(context as? CommandContext<T> ?: return)
+        if (clazz.safeCast(context.sender) == null) return
+        execution(context as? CommandContext<C> ?: return)
     }
 }
\ No newline at end of file
diff --git a/common/src/main/kotlin/com/undefined/stellar/data/execution/StellarRunnable.kt b/common/src/main/kotlin/com/undefined/stellar/data/execution/StellarRunnable.kt
index dc07670..5f6a8c8 100644
--- a/common/src/main/kotlin/com/undefined/stellar/data/execution/StellarRunnable.kt
+++ b/common/src/main/kotlin/com/undefined/stellar/data/execution/StellarRunnable.kt
@@ -2,10 +2,13 @@ package com.undefined.stellar.data.execution
 
 import com.undefined.stellar.data.argument.CommandContext
 import org.bukkit.command.CommandSender
+import kotlin.reflect.KClass
+import kotlin.reflect.safeCast
 
 @Suppress("UNCHECKED_CAST")
-data class StellarRunnable<C : CommandSender>(val execution: CommandContext<C>.() -> Boolean) {
+data class StellarRunnable<C : CommandSender>(val clazz: KClass<C>, val execution: CommandContext<C>.() -> Boolean) {
     operator fun invoke(context: CommandContext<CommandSender>): Boolean {
+        if (clazz.safeCast(context.sender) == null) return true
         return execution(context as? CommandContext<C> ?: return true)
     }
 }
\ No newline at end of file
diff --git a/common/src/main/kotlin/com/undefined/stellar/data/requirement/StellarRequirement.kt b/common/src/main/kotlin/com/undefined/stellar/data/requirement/StellarRequirement.kt
index d69ac4e..f7f38d1 100644
--- a/common/src/main/kotlin/com/undefined/stellar/data/requirement/StellarRequirement.kt
+++ b/common/src/main/kotlin/com/undefined/stellar/data/requirement/StellarRequirement.kt
@@ -1,10 +1,11 @@
 package com.undefined.stellar.data.requirement
 
 import org.bukkit.command.CommandSender
+import kotlin.reflect.KClass
+import kotlin.reflect.safeCast
 
-@Suppress("UNCHECKED_CAST")
-data class StellarRequirement<C : CommandSender>(val execution: C.() -> Boolean) {
+data class StellarRequirement<C : CommandSender>(val clazz: KClass<C>, val requirement: C.() -> Boolean) {
     operator fun invoke(sender: CommandSender): Boolean {
-        return execution(sender as? C ?: return true)
+        return requirement(clazz.safeCast(sender) ?: return true)
     }
 }
\ No newline at end of file
diff --git a/common/src/main/kotlin/com/undefined/stellar/data/suggestion/GreedyStellarSuggestion.kt b/common/src/main/kotlin/com/undefined/stellar/data/suggestion/GreedyStellarSuggestion.kt
index e7d3a46..75b0ef9 100644
--- a/common/src/main/kotlin/com/undefined/stellar/data/suggestion/GreedyStellarSuggestion.kt
+++ b/common/src/main/kotlin/com/undefined/stellar/data/suggestion/GreedyStellarSuggestion.kt
@@ -2,7 +2,12 @@ package com.undefined.stellar.data.suggestion
 
 import com.undefined.stellar.data.argument.GreedyCommandContext
 import org.bukkit.command.CommandSender
+import kotlin.reflect.KClass
+import kotlin.reflect.safeCast
 
-data class GreedyStellarSuggestion<C : CommandSender>(val suggestion: GreedyCommandContext<C>.() -> List<Suggestion>) {
-    fun get(context: GreedyCommandContext<C>): List<Suggestion> = suggestion(context)
+data class GreedyStellarSuggestion<C : CommandSender>(val clazz: KClass<C>, val suggestion: GreedyCommandContext<C>.() -> List<Suggestion>) {
+    fun get(context: GreedyCommandContext<C>): List<Suggestion> {
+        if (clazz.safeCast(context.sender) == null) return listOf()
+        return suggestion(context)
+    }
 }
\ No newline at end of file
diff --git a/common/src/main/kotlin/com/undefined/stellar/data/suggestion/StellarSuggestion.kt b/common/src/main/kotlin/com/undefined/stellar/data/suggestion/StellarSuggestion.kt
index 657cbcb..1459fd5 100644
--- a/common/src/main/kotlin/com/undefined/stellar/data/suggestion/StellarSuggestion.kt
+++ b/common/src/main/kotlin/com/undefined/stellar/data/suggestion/StellarSuggestion.kt
@@ -2,7 +2,12 @@ package com.undefined.stellar.data.suggestion
 
 import com.undefined.stellar.data.argument.CommandContext
 import org.bukkit.command.CommandSender
+import kotlin.reflect.KClass
+import kotlin.reflect.safeCast
 
-data class StellarSuggestion<C : CommandSender>(val suggestion: CommandContext<C>.() -> List<Suggestion>) {
-    fun get(context: CommandContext<C>): List<Suggestion> = suggestion(context)
+data class StellarSuggestion<C : CommandSender>(val clazz: KClass<C>, val suggestion: CommandContext<C>.() -> List<Suggestion>) {
+    fun get(context: CommandContext<C>): List<Suggestion> {
+        if (clazz.safeCast(context.sender) == null) return listOf()
+        return suggestion(context)
+    }
 }
\ No newline at end of file
diff --git a/server/build.gradle.kts b/server/build.gradle.kts
index 47c1aff..94af2a6 100644
--- a/server/build.gradle.kts
+++ b/server/build.gradle.kts
@@ -9,7 +9,7 @@ val groupIdVar = "com.undefined"
 val artifactIdVar = "stellar"
 
 dependencies {
-    compileOnly("org.spigotmc:spigot-api:1.20.5-R0.1-SNAPSHOT")
+    compileOnly("org.spigotmc:spigot-api:1.20.4-R0.1-SNAPSHOT")
 
     implementation(project(":api"))
     implementation(project(":common"))
@@ -19,7 +19,7 @@ dependencies {
     implementation(project(":v1_21_1:", "reobf"))
     implementation(project(":v1_21_3:", "reobf"))
     implementation(project(":v1_21_4:", "reobf"))
-    compileOnly(project(":v1_21_4"))
+    compileOnly(project(":v1_20_4"))
 }
 
 tasks {
@@ -36,7 +36,7 @@ tasks {
     }
 
     runServer {
-        minecraftVersion("1.20.5")
+        minecraftVersion("1.20.4")
         jvmArgs("-Xmx2G")
     }
 }
diff --git a/server/src/main/kotlin/com/undefined/stellar/Main.kt b/server/src/main/kotlin/com/undefined/stellar/Main.kt
index b2c4c96..7cc95b0 100644
--- a/server/src/main/kotlin/com/undefined/stellar/Main.kt
+++ b/server/src/main/kotlin/com/undefined/stellar/Main.kt
@@ -8,7 +8,7 @@ class Main : JavaPlugin() {
     override fun onEnable() {
         StellarCommand("test")
             .addLocationArgument("location")
-            .addWolfVariantArgument("test")
+            .addStringArgument("string")
             .addExecution<Player> {
                 sender.sendMessage(arguments.toList().withIndex().joinToString(", ") { "${it.index}: ${it.value.first}" })
             }
diff --git a/server/src/main/resources/plugin.yml b/server/src/main/resources/plugin.yml
index b40230b..1053801 100644
--- a/server/src/main/resources/plugin.yml
+++ b/server/src/main/resources/plugin.yml
@@ -1,4 +1,4 @@
 name: Stellar
 version: '${version}'
 main: com.undefined.stellar.Main
-api-version: '1.20.6'
\ No newline at end of file
+api-version: '1.20'
\ No newline at end of file
diff --git a/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/ArgumentHelper.kt b/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/ArgumentHelper.kt
similarity index 98%
rename from v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/ArgumentHelper.kt
rename to v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/ArgumentHelper.kt
index fa6c184..bc1ddce 100644
--- a/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/ArgumentHelper.kt
+++ b/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/ArgumentHelper.kt
@@ -1,4 +1,4 @@
-package com.undefined.stellar.v1_20_6
+package com.undefined.stellar.v1_20_4
 
 import com.mojang.brigadier.arguments.*
 import com.mojang.brigadier.builder.ArgumentBuilder
@@ -41,7 +41,7 @@ import com.undefined.stellar.data.argument.ParticleData
 import com.undefined.stellar.exception.ArgumentVersionMismatchException
 import com.undefined.stellar.exception.LiteralArgumentMismatchException
 import com.undefined.stellar.exception.UnsupportedArgumentException
-import com.undefined.stellar.v1_20_6.BrigadierCommandHelper.version
+import com.undefined.stellar.v1_20_4.BrigadierCommandHelper.version
 import net.kyori.adventure.text.format.Style
 import net.kyori.adventure.text.format.TextColor
 import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer
@@ -129,9 +129,13 @@ object ArgumentHelper {
                 LocationType.DOUBLE_LOCATION_2D -> Vec2Argument.vec2()
             }
             is BlockDataArgument -> BlockStateArgument.block(COMMAND_BUILD_CONTEXT)
-            is com.undefined.stellar.argument.types.block.BlockPredicateArgument -> BlockPredicateArgument.blockPredicate(COMMAND_BUILD_CONTEXT)
+            is com.undefined.stellar.argument.types.block.BlockPredicateArgument -> BlockPredicateArgument.blockPredicate(
+                COMMAND_BUILD_CONTEXT
+            )
             is com.undefined.stellar.argument.types.item.ItemArgument -> ItemArgument.item(COMMAND_BUILD_CONTEXT)
-            is com.undefined.stellar.argument.types.item.ItemPredicateArgument -> ItemPredicateArgument.itemPredicate(COMMAND_BUILD_CONTEXT)
+            is com.undefined.stellar.argument.types.item.ItemPredicateArgument -> ItemPredicateArgument.itemPredicate(
+                COMMAND_BUILD_CONTEXT
+            )
             is com.undefined.stellar.argument.types.text.ColorArgument -> ColorArgument.color()
             is com.undefined.stellar.argument.types.text.ComponentArgument -> ComponentArgument.textComponent()
             is com.undefined.stellar.argument.types.text.StyleArgument -> StyleArgument.style()
@@ -139,7 +143,9 @@ object ArgumentHelper {
             is com.undefined.stellar.argument.types.scoreboard.ObjectiveArgument -> ObjectiveArgument.objective()
             is com.undefined.stellar.argument.types.scoreboard.ObjectiveCriteriaArgument -> ObjectiveCriteriaArgument.criteria()
             is com.undefined.stellar.argument.types.math.OperationArgument -> OperationArgument.operation()
-            is com.undefined.stellar.argument.types.item.ParticleArgument -> ParticleArgument.particle(COMMAND_BUILD_CONTEXT)
+            is com.undefined.stellar.argument.types.item.ParticleArgument -> ParticleArgument.particle(
+                COMMAND_BUILD_CONTEXT
+            )
             is com.undefined.stellar.argument.types.math.AngleArgument -> AngleArgument.angle()
             is com.undefined.stellar.argument.types.math.RotationArgument -> RotationArgument.rotation()
             is DisplaySlotArgument -> ScoreboardSlotArgument.displaySlot()
@@ -218,7 +224,8 @@ object ArgumentHelper {
             }
             is com.undefined.stellar.argument.types.text.ColorArgument -> ColorArgument.getColor(context, argument.name).color?.let { Style.style(TextColor.color(it)) } ?: Style.empty()
             is com.undefined.stellar.argument.types.text.ComponentArgument ->  GsonComponentSerializer.gson().deserialize(Component.Serializer.toJson(ComponentArgument.getComponent(context, argument.name)))
-            is com.undefined.stellar.argument.types.text.StyleArgument ->  GsonComponentSerializer.gson().deserialize(getArgumentInput(context, argument.name) ?: return null).style()
+            is com.undefined.stellar.argument.types.text.StyleArgument ->  GsonComponentSerializer.gson().deserialize(
+                getArgumentInput(context, argument.name) ?: return null).style()
             is com.undefined.stellar.argument.types.text.MessageArgument ->  GsonComponentSerializer.gson().deserialize(Component.Serializer.toJson(MessageArgument.getMessage(context, argument.name)))
             is com.undefined.stellar.argument.types.scoreboard.ObjectiveArgument ->  Bukkit.getScoreboardManager().mainScoreboard.getObjective(ObjectiveArgument.getObjective(context, argument.name).name)
             is com.undefined.stellar.argument.types.scoreboard.ObjectiveCriteriaArgument ->  ObjectiveCriteriaArgument.getCriteria(context, argument.name).name
diff --git a/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/BrigadierCommandHelper.kt b/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/BrigadierCommandHelper.kt
similarity index 97%
rename from v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/BrigadierCommandHelper.kt
rename to v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/BrigadierCommandHelper.kt
index 2581fbd..9c52b97 100644
--- a/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/BrigadierCommandHelper.kt
+++ b/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/BrigadierCommandHelper.kt
@@ -1,4 +1,4 @@
-package com.undefined.stellar.v1_20_6
+package com.undefined.stellar.v1_20_4
 
 import com.mojang.brigadier.builder.LiteralArgumentBuilder
 import com.mojang.brigadier.context.CommandContext
@@ -31,6 +31,7 @@ object BrigadierCommandHelper {
     }
 
     fun fulfillsRequirements(command: AbstractStellarCommand<*>, source: CommandSourceStack): Boolean {
+        println(source.bukkitSender::class.simpleName)
         val fulfillsExecutionRequirements = command.requirements.all { it(source.bukkitSender) }
         val fulfillsPermissionRequirements = command.permissionRequirements.all { source.hasPermission(it.level, it.permission) }
         return fulfillsExecutionRequirements.and(fulfillsPermissionRequirements)
diff --git a/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/CommandAdapter.kt b/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/CommandAdapter.kt
similarity index 98%
rename from v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/CommandAdapter.kt
rename to v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/CommandAdapter.kt
index e472913..87764ad 100644
--- a/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/CommandAdapter.kt
+++ b/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/CommandAdapter.kt
@@ -1,4 +1,4 @@
-package com.undefined.stellar.v1_20_6
+package com.undefined.stellar.v1_20_4
 
 import com.mojang.brigadier.Command
 import com.mojang.brigadier.builder.ArgumentBuilder
diff --git a/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/CommandContextAdapter.kt b/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/CommandContextAdapter.kt
similarity index 99%
rename from v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/CommandContextAdapter.kt
rename to v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/CommandContextAdapter.kt
index 2cc02b5..0ab8048 100644
--- a/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/CommandContextAdapter.kt
+++ b/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/CommandContextAdapter.kt
@@ -1,4 +1,4 @@
-package com.undefined.stellar.v1_20_6
+package com.undefined.stellar.v1_20_4
 
 import com.mojang.brigadier.context.CommandContext
 import com.undefined.stellar.AbstractStellarCommand
diff --git a/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/CommandRegistrar.kt b/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/CommandRegistrar.kt
similarity index 93%
rename from v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/CommandRegistrar.kt
rename to v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/CommandRegistrar.kt
index e964307..c991e5a 100644
--- a/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_6/CommandRegistrar.kt
+++ b/v1_20_4/src/main/kotlin/com/undefined/stellar/v1_20_4/CommandRegistrar.kt
@@ -1,9 +1,9 @@
-package com.undefined.stellar.v1_20_6
+package com.undefined.stellar.v1_20_4
 
 import com.undefined.stellar.AbstractStellarCommand
 import com.undefined.stellar.StellarCommands
 import com.undefined.stellar.registrar.AbstractCommandRegistrar
-import com.undefined.stellar.v1_20_6.BrigadierCommandHelper.dispatcher
+import com.undefined.stellar.v1_20_4.BrigadierCommandHelper.dispatcher
 import org.bukkit.command.CommandSender
 
 object CommandRegistrar : AbstractCommandRegistrar {