diff --git a/src/engine/wpakpowers/Behaviours.java b/src/engine/wpakpowers/Behaviours.java
index c6fbac38..48aaf316 100644
--- a/src/engine/wpakpowers/Behaviours.java
+++ b/src/engine/wpakpowers/Behaviours.java
@@ -17,6 +17,8 @@ import engine.wpak.data.ModifierEntry;
 import engine.wpak.data.Power;
 import engine.wpak.data.PowerAction;
 
+import java.util.ArrayList;
+
 public class Behaviours {
 
     public static Object Flag(AbstractCharacter caster, Power power, Integer rank, AbstractWorldObject target,
@@ -76,8 +78,23 @@ public class Behaviours {
 
     public static Object SubTypeMod(AbstractCharacter caster, Power power, Integer rank, AbstractWorldObject target,
                                     PowerAction powerAction, Effect effect, ModifierEntry modifierEntry) {
-        System.out.println("Behavior method called");
-        return null;
+
+        mbEnums.ModType noMod = mbEnums.ModType.valueOf(modifierEntry.arg1);
+        ArrayList<Effect> removeList = new ArrayList<>();
+
+        // Iterate through effects on target slating to remove
+        // all which match the intended modType
+
+        for (AppliedEffect appliedEffect : target._effects.values())
+            if (appliedEffect.modifiers.keySet().contains(noMod))
+                removeList.add(appliedEffect.effect);
+
+        for (Effect effectEntry : removeList)
+            target._effects.remove(effectEntry);
+
+        // target.updateBonuses?
+
+        return noMod;
     }
 
     public static Object SubTypePower(AbstractCharacter caster, Power power, Integer rank, AbstractWorldObject target,