Dark magic is the only magic that must be given before it can be learned, and is almost exclusively found in those who have dealt with the Devil. Due to the nature of simply obtaining the magic, mastering it is quite the difficult feat. Once mastered, you can cast green fire with the same conditions as fire magic - minus the weakness to water -, and control corruption to some extent. Forbidden magics such as necromancy, blood bindings, and even shape-shifting will also come much easier to the user.