No one finds the Remover of Inconvient Things, The Remover finds you. So be careful about what you whisper in the dark, The Remover may hear it and come.
All spell casters gain their abilities through a form of demon possession. So in order to gain magical abilites, PCs must track down and trap demons. Of course there are some pretty powerful demons, if the demon is stronger than the PC, the PC could find themselves subjugated to the Demon's will.