An ancient vampire, his hands have deformed into hoofs. His name is ancient Greek meaning "The worst of the worst." He was first seen in Sunnydale tracking down Faith, who had scarred him across the eye. He, like The Master practised ancient rituals and thought in a very traditional vampire way.
He was killed when Faith thrust a giant piece of wood through his chest
Kakistos is the show's oldest Vampire excluding The Master. His physical appearance and abilities are very typical of an older vampire.