Not much is known about this teenage boy. He claims that he is a spirit, an experiment, and can transform into a weapon of the person he ‘bonds’ with choice. His father was a sword that held a powerful demon in stasis for years for reasons unknown. After the party removed the sword, defeated the demon, and allowed Zack’Hei’s father to pass on, the boy agreed to bond with someone from the party. Due to Gwen’s martial prowess during the battle, Zack’Hei offered to bond with her, which she accepted. Since that moment, the boy did transform into a warhammer but claimed he needed to rest for undetermined amount of time.