I think about making power to convert dead beings via resurrecting them. Like Rias Gremory (Highschool DxD) could resurrect other humans and make them devils (demons) via Evil Pieces. I wonder do you know any users?
@Rkv0 Not quite. In case if reincarnation, your spiritual essence passes in another body and starts completely new life. But resurrection is about entering past body and continue the last life.