I think this is a neat character, with an interesting background story, but the writing needs some polishing. I also think some things need to be elaborated on, while others don't require as much detail as you have. For example, why did the guy who trained the npc blackmail someone into taking him as an apprentice. What did he gain from that? I totally missed that. Tweak it a little and you'll be on the right track. :) Go to Comment
The party is walking through the forest at night when they come upon a clearing. Half a dozen black-robed corpses lie scattered across the ground, and a pentagram of blood is shoddily drawn in the dirt.
It seems these people summoned something they could not control. Whether or not the demon returns is up to the GM, but it would be just as rich if the demon never returned, and for the rest of the night, every stray sound or odd shadow will be jumped at!