Skull

With an average lifespan of 200 years, Skulls are the guardians and caretakers of the Earl's Akuma-producing plant. Skulls are humanoids that wear large black robes and have skull-like heads, as their names imply, tasked with cleaning the Noah's Ark, creating Akuma, guarding the egg and caring the Earl's clothes, among other odd jobs. Skulls are neither Akuma, nor completely human, and are created by transforming a human with a 'suitable' mind using a special form of magic: A Skull places their fingers against the forehead of a victim and chant an incantation, surrounding the human in question with arcs of energy and shrouding them in a cocoon made of a black thread-like substance, finally emerging a few moments later as a Skull. Skulls are very resistant, capable of taking a bullet to the head without any lasting damage. The newborns are quite slow, but the older ones function at a more grown human rate.