All damage type lookups go through method

src/engine/powers/effectmodifiers/DamageShieldEffectModifier.java

@@ -49,7 +49,7 @@ public class DamageShieldEffectModifier extends AbstractEffectModifier {
                 amount *= (1 + mod);
         }
 
-        Enum.DamageType dt = Enum.DamageType.valueOf(this.type);
+        Enum.DamageType dt = Enum.DamageType.GetDamageType(this.type);
 
         if (dt != null) {