diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/mobs/NewDM300.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/mobs/NewDM300.java
index a07477427..0efc4cb04 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/mobs/NewDM300.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/actors/mobs/NewDM300.java
@@ -427,13 +427,17 @@ public class NewDM300 extends Mob {
 
 	@Override
 	public void damage(int dmg, Object src) {
+		int preHP = HP;
 		super.damage(dmg, src);
 		if (isInvulnerable(src.getClass())){
 			return;
 		}
 
-		LockedFloor lock = Dungeon.hero.buff(LockedFloor.class);
-		if (lock != null && !isImmune(src.getClass())) lock.addTime(dmg);
+		int dmgTaken = preHP - HP;
+		if (dmgTaken > 0) {
+			LockedFloor lock = Dungeon.hero.buff(LockedFloor.class);
+			if (lock != null && !isImmune(src.getClass())) lock.addTime(dmgTaken*1.5f);
+		}
 
 		int threshold = HT/3 * (2- pylonsActivated);