Simon Alliant is an exorcist who battles demons, whether he wants to or not. Sometimes it's not so bad...he gets to play with magic, after all.
But for Simon, magic represents a demon of another kind. He's addicted to magic and it takes more than a handful of charms to keep that particular demon at bay.
Call him "exorcist". Call him "master of the dark arts". Call him "dime-store magician". Most names don't matter... not when Hell already knows yours.