I own the Runesword, which has 200 attack damage. A lot, I must say.
So then when I kill a munchkin, it’s health goes crazy.
From 16 to about -180!!
Maybe the team can fix this problem by making the enemy’s health turn to ‘0’ or make it vanish.
Thank you.
This is very normal. If your attack damage is greater than the enemy’s current health, their health will become negative.
I mean it doesn’t really matter either. And imo it just makes thing a tad more satisfying when you click on a munchkins health bar and it says -500 
Yeah it’s a bit fun 