Imagine a villain, he got cursed by the hero to never be able to take live again forever no matter what he does.
Instead giving up he become more sadist. Since anything he do he can't take life, any lethal damage he does to other people won't kill them. They gonna lived no matter what the villain did. He back at it again, to be the worst villain in history.
He can burn a villager to crisp, he won't die. The villager is normal villager, can't regenerate or anything, just can't die. The next hero can't do anything other than kill his victim, the only salvation
Instead giving up he become more sadist. Since anything he do he can't take life, any lethal damage he does to other people won't kill them. They gonna lived no matter what the villain did. He back at it again, to be the worst villain in history.
He can burn a villager to crisp, he won't die. The villager is normal villager, can't regenerate or anything, just can't die. The next hero can't do anything other than kill his victim, the only salvation