diff --git a/common/src/main/kotlin/com/undefined/stellar/argument/SubCommandHandler.kt b/common/src/main/kotlin/com/undefined/stellar/argument/SubCommandHandler.kt
index e73466c..ace3bf1 100644
--- a/common/src/main/kotlin/com/undefined/stellar/argument/SubCommandHandler.kt
+++ b/common/src/main/kotlin/com/undefined/stellar/argument/SubCommandHandler.kt
@@ -8,6 +8,7 @@ import com.undefined.stellar.argument.types.custom.OnlinePlayersArgument
 import com.undefined.stellar.argument.types.entity.EntityAnchorArgument
 import com.undefined.stellar.argument.types.entity.EntityArgument
 import com.undefined.stellar.argument.types.entity.EntityDisplayType
+import com.undefined.stellar.argument.types.entity.PotionEffectTypeArgument
 import com.undefined.stellar.argument.types.item.ItemArgument
 import com.undefined.stellar.argument.types.item.ItemPredicateArgument
 import com.undefined.stellar.argument.types.item.ItemSlotArgument
@@ -208,4 +209,7 @@ open class ArgumentHandler {
     fun addStructureTypeArgument(name: String): StructureTypeArgument =
         addArgument { StructureTypeArgument(base, name) }
 
+    fun addPotionEffectTypeArgument(name: String): PotionEffectTypeArgument =
+        addArgument { PotionEffectTypeArgument(base, name) }
+
 }
\ No newline at end of file
diff --git a/common/src/main/kotlin/com/undefined/stellar/argument/types/entity/PotionEffectTypeArgument.kt b/common/src/main/kotlin/com/undefined/stellar/argument/types/entity/PotionEffectTypeArgument.kt
new file mode 100644
index 0000000..24c8c76
--- /dev/null
+++ b/common/src/main/kotlin/com/undefined/stellar/argument/types/entity/PotionEffectTypeArgument.kt
@@ -0,0 +1,6 @@
+package com.undefined.stellar.argument.types.entity
+
+import com.undefined.stellar.AbstractStellarCommand
+import com.undefined.stellar.argument.AbstractStellarArgument
+
+class PotionEffectTypeArgument(parent: AbstractStellarCommand<*>, name: String) : AbstractStellarArgument<PotionEffectTypeArgument>(parent, name)
\ No newline at end of file
diff --git a/server/src/main/kotlin/com/undefined/stellar/Main.kt b/server/src/main/kotlin/com/undefined/stellar/Main.kt
index 289eaea..9fd17f2 100644
--- a/server/src/main/kotlin/com/undefined/stellar/Main.kt
+++ b/server/src/main/kotlin/com/undefined/stellar/Main.kt
@@ -1,16 +1,16 @@
 package com.undefined.stellar
 
 import org.bukkit.entity.Player
-import org.bukkit.generator.structure.StructureType
 import org.bukkit.plugin.java.JavaPlugin
+import org.bukkit.potion.PotionEffectType
 
 class Main : JavaPlugin() {
 
     override fun onEnable() {
         val main = StellarCommand("test", description = "this is a description", "othertest")
-        main.addStructureTypeArgument("type")
+        main.addPotionEffectTypeArgument("type")
             .addExecution<Player> {
-                source.sendMessage(getArgument<StructureType>("type").key.toString())
+                source.sendMessage(getArgument<PotionEffectType>("type").key.toString())
             }
             .register(this)
     }
diff --git a/v1_20_6/src/main/kotlin/com/undefined/stellar/v1_20_6/ArgumentHelper.kt b/v1_20_6/src/main/kotlin/com/undefined/stellar/v1_20_6/ArgumentHelper.kt
index 75d5c00..4fbda43 100644
--- a/v1_20_6/src/main/kotlin/com/undefined/stellar/v1_20_6/ArgumentHelper.kt
+++ b/v1_20_6/src/main/kotlin/com/undefined/stellar/v1_20_6/ArgumentHelper.kt
@@ -15,6 +15,7 @@ import com.undefined.stellar.argument.types.custom.CustomArgument
 import com.undefined.stellar.argument.types.custom.EnumArgument
 import com.undefined.stellar.argument.types.custom.ListArgument
 import com.undefined.stellar.argument.types.entity.EntityDisplayType
+import com.undefined.stellar.argument.types.entity.PotionEffectTypeArgument
 import com.undefined.stellar.argument.types.item.ItemSlotArgument
 import com.undefined.stellar.argument.types.item.ItemSlotsArgument
 import com.undefined.stellar.argument.types.math.AxisArgument
@@ -148,6 +149,7 @@ object ArgumentHelper {
             is UUIDArgument -> UuidArgument.uuid()
             is GameEventArgument -> ResourceKeyArgument.key(Registries.GAME_EVENT)
             is StructureTypeArgument -> ResourceKeyArgument.key(Registries.STRUCTURE_TYPE)
+            is PotionEffectTypeArgument -> ResourceKeyArgument.key(Registries.MOB_EFFECT)
             else -> throw UnsupportedArgumentException()
         }
 
@@ -217,6 +219,7 @@ object ArgumentHelper {
             is UUIDArgument -> UuidArgument.getUuid(context, argument.name)
             is GameEventArgument -> org.bukkit.Registry.GAME_EVENT.get(getId(context, argument.name, Registries.GAME_EVENT))
             is StructureTypeArgument -> org.bukkit.Registry.STRUCTURE_TYPE.get(getId(context, argument.name, Registries.STRUCTURE_TYPE))
+            is PotionEffectTypeArgument -> org.bukkit.Registry.POTION_EFFECT_TYPE.get(getId(context, argument.name, Registries.MOB_EFFECT))
             else -> throw UnsupportedArgumentException()
         }
     }