However, the plots severely diverge from each other by the middle of the story, specifically around the time where Roy Mustang's friend Maes Hughes is murdered by the homunculus Envy in disguise. Dante, a former lover of Hohenheim and mentor to the Elric brothers' teacher, is the series' central antagonist. Centuries ago, Hohenheim and Dante perfected methods for making the Philosopher's Stone and achieved immortality by transferring their souls and intellects into other bodies as they age.