Werewolf, or a Lycan. Lycanthropy was considered a real disease in ancient times where a bite from a wolf resulted in becoming a monster that would change from a human to a werewolf during the full moon.
Drawing by Vee Ladwa "Well, Hello beautiful, you must be Harvey's squeeze! And you are beautiful. Well you look nervous, is it the scars?" Joker to Rachel Dawes in The Dark Night Some men just want to watch the world burn. Alfred, The Dark Night