Void creatures come from the void. I like to picture them like cultists from lovecraft I guess, like the void beings from that movie The Void that came out not to long ago.
Where are the demons from? Also, why are they immune to deathfog? I dragged deathfog barrels to the evil Demon Ardamalik's house and filled his house with deathfog to kill him quick. It didn't hurt anyone in the whole place... that don't seem right to me.
