My suggestion is that you have a game that follows one of the apprentices as he/she journeys on a quest and fights bad people. Based on a storyline from the books. Actually, you can have several games each featuring a different character. It could be: Warriors Quest: So and so's Story or something like that. It might take a while but it could be cool :)
He doesn't have internet access at the moment, so he might not get back to you on that for a while. If you want to know how I know this its because i know him in real life.