Magical energies abound in the land around the Pit of Infren and Last Stand. Magical mining towns would abound in this fertile area, if they could survive.
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.