The antagonist in my story removed his soul from his body in order to replace it with that of a demon. By doing so, he gained the demon's power for his own. The downside to bearing the soul of a demon in his body is he must constantly maintain control. Failure to do so would result in the demon taking command of the host (his physical body) to use for its own purposes. My question is this: what kind of an art uses such tactics as this? My first thought was necromancy. As an avid gamer I see such characters depicted as anyone who deals with the dead; be they demons, devils, the damned, or otherwise. Research has lead me to learn that Necromancy was a form of divination and that modern media is to blame for naming all who deal with the dead as necromancers. Does my antagonist fit into this new stereotypical role or should I rename his art? I feel "sorcerer" and "wizard" wouldn't be the correct term for the antagonist. What are your ideas on this?
It should be noted that the demons in my tale are not conjured beasts, but the souls of the wicked in Hell. Most suffer for eternity for their misdeeds, but those who sold themselves to the King of Hell become his servants and, in time, demons. The older the soul, the more powerful the demon.