diff --git a/src/actor.h b/src/actor.h
index 52a50b04e..f46ee7148 100644
--- a/src/actor.h
+++ b/src/actor.h
@@ -971,6 +971,7 @@ public:
 	FNameNoInit DamageType;
 	FNameNoInit DamageTypeReceived;
 	fixed_t DamageFactor;
+	fixed_t DamageMultiply;
 
 	FNameNoInit PainType;
 	FNameNoInit DeathType;
diff --git a/src/p_acs.cpp b/src/p_acs.cpp
index 0a8eef879..fd263490a 100644
--- a/src/p_acs.cpp
+++ b/src/p_acs.cpp
@@ -3673,6 +3673,7 @@ enum
 	APROP_AttackZOffset	= 40,
 	APROP_StencilColor	= 41,
 	APROP_Friction		= 42,
+	APROP_DamageMultiplier=43,
 };
 
 // These are needed for ACS's APROP_RenderStyle
@@ -3862,6 +3863,10 @@ void DLevelScript::DoSetActorProperty (AActor *actor, int property, int value)
 		actor->DamageFactor = value;
 		break;
 
+	case APROP_DamageMultiplier:
+		actor->DamageMultiply = value;
+		break;
+
 	case APROP_MasterTID:
 		AActor *other;
 		other = SingleActorFromTID (value, NULL);
@@ -3933,6 +3938,7 @@ int DLevelScript::GetActorProperty (int tid, int property, const SDWORD *stack,
 	case APROP_Speed:		return actor->Speed;
 	case APROP_Damage:		return actor->Damage;	// Should this call GetMissileDamage() instead?
 	case APROP_DamageFactor:return actor->DamageFactor;
+	case APROP_DamageMultiplier: return actor->DamageMultiply;
 	case APROP_Alpha:		return actor->alpha;
 	case APROP_RenderStyle:	for (int style = STYLE_None; style < STYLE_Count; ++style)
 							{ // Check for a legacy render style that matches.
diff --git a/src/p_interaction.cpp b/src/p_interaction.cpp
index 4ee86d82c..fb947f309 100644
--- a/src/p_interaction.cpp
+++ b/src/p_interaction.cpp
@@ -1065,10 +1065,16 @@ int P_DamageMobj (AActor *target, AActor *inflictor, AActor *source, int damage,
 			}
 		}
 		// Handle active damage modifiers (e.g. PowerDamage)
-		if (source != NULL && source->Inventory != NULL)
+		if (source != NULL)
 		{
 			int olddam = damage;
-			source->Inventory->ModifyDamage(olddam, mod, damage, false);
+
+			if (source->Inventory != NULL)
+			{
+				source->Inventory->ModifyDamage(olddam, mod, damage, false);
+			}
+			damage = FixedMul(damage, source->DamageMultiply);
+
 			if (olddam != damage && damage <= 0)
 			{ // Still allow FORCEPAIN
 				if (MustForcePain(target, inflictor))
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index 4ef075720..cf6bccc8a 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -312,8 +312,16 @@ void AActor::Serialize (FArchive &arc)
 	}
 	arc << lastpush << lastbump
 		<< PainThreshold
-		<< DamageFactor
-		<< WeaveIndexXY << WeaveIndexZ
+		<< DamageFactor;
+	if (SaveVersion >= 4516)
+	{
+		arc << DamageMultiply;
+	}
+	else
+	{
+		DamageMultiply = FRACUNIT;
+	}
+	arc << WeaveIndexXY << WeaveIndexZ
 		<< PoisonDamageReceived << PoisonDurationReceived << PoisonPeriodReceived << Poisoner
 		<< PoisonDamage << PoisonDuration << PoisonPeriod;
 	if (SaveVersion >= 3235)
@@ -3867,6 +3875,7 @@ AActor *AActor::StaticSpawn (const PClass *type, fixed_t ix, fixed_t iy, fixed_t
 	actor->touching_sectorlist = NULL;	// NULL head of sector list // phares 3/13/98
 	if (G_SkillProperty(SKILLP_FastMonsters))
 		actor->Speed = actor->GetClass()->Meta.GetMetaFixed(AMETA_FastSpeed, actor->Speed);
+	actor->DamageMultiply = FRACUNIT;
 
 
 	// set subsector and/or block links