Evil Functional Magic. A type of magic (or equivalent force) that centres on detrimental effects. "Bad" powers, the stuff that the Anti-Hero, Evil Sorcerer or Wicked Witch uses, and the Evil Counterpart of White Magic. Probably called this because we tend to think of darkness as evil. If heroes use it, they're headed for a fall, or at least An Aesop. Black Magic has the tendency to corrupt more than just the actions it enables.