"...and thus it was said that Adaleer the Blest could reflect the true nature of any soul. Now some of his followers believed that his ranger gear, as much a part of him as his faith, was also so blest."
- Dauneth, Lore Chronicles
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.