Felim collapsed into the snow, exhausted. It felt like it would be the last fall this time, his limbs stiffening and flesh numb. The adventurer had heard of natives that thrived out here, men who slew bears and made coats of seal fur. But who could build anything out here...?
Just as he felt light start to fade, Felim cast his gaze up to see the sky one last time. He was startled - or would have been, if his body had the energy - to see a furred hood and a leathery face with a toothless grin. "Ho there, brother!" it spoke. "You came to just the right place."
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.