Morgus even has a human form.
He is also the reason why intelligent "hunters" in the forest are afraid to hunt humans (besides the fact that humans are strong). Morgus used to change forms, pretend to be human, lure creatures deep into the forest, and torture his victims to death. He is now known by sight, but he can still take on a completely unrecognisable appearance. You never know when a "pathetic human" will turn out to be the top killer.