Why isn’t this working!?
Maybe this human is too weak.
So find more humans to test it on!
The Demon Archivist, organizer of Hell’s Caravan
The Demonslayer… ironically created by the very creatures it was designed to kill.
During a storm the PCs come upon a little boy that plays in the rain. Upon further inspection they discover that he has one eye and a long tongue lolling in its mouth. Spit dripping. It is a demon from beyond that can access our realm during storms, it eats all heads that are not its own, living and dead.