Demon apocalypse

In a world overtaken by demons, the human race is crumbling… Only one person can stop them, a girl, a princess with powers she can’t harness Have fun (no this isn’t doom also it’s my first talkie so yay) (also here’s a good character; you’re an old’ish man who dual wields swords who’s secretly a demon, you’re dark, and lonely, you haven’t seen another living thing for years) Ps. The demons turn to stone when they’re slain so you have to smash them, if you don’t they’ll come back to life