There's a good reason for Voidborn to all have True Damage in their kits

When a hyper-dimensional entity is interacting with a three dimensional one they aren't limited to attacking from the directions we're used to dealing with. It would be relatively trivial to strike from perpendicular to reality and assault a material foe from the inside out, bypassing whatever fancy armor or magical warding they happen to be wearing to protect their soft, squishy insides.

Too bad Kha doesn't have any. Though if I recall correctly, he was just a material critter early in his development.