Harvey Dent was Gotham City's heroic and kind-hearted district-attorney and one of Batman's strongest allies until Sal "Boss" Maroni threw acid in his face, hideously scarring him. It also fractured his mental state, causing him to become Two-Face, a schizoid criminal-mastermind obsessed with the number two. His former good luck charm, a "two-headed" silver dollar, was damaged on one side during the attack that ruined half his face, and Dent has seized on it as a reflection of his half-scarred visage. He flips it to decide the fates of his victims. Despite Batman's efforts to reform his former ally, Dent is consumed by his fixation on chance and his crimes are designed to prove out his diametric philosophy.