deadpixel, Very well he is accepted. I'd just change his occupation to be part of a general mage college not one of necromancy. That'd be like having a bomb making or hacking majors :p

Patriarch, like I said in the OP you can adapt any mythology, folklore, or fairy tale, even classic works of literature like Shakespeare's plays, old novels, or poems even nursery rhymes or urban legends. If you've ever played the Wolf Among Us that should give you a good measure of what you can adapt here.

There are no hard and fast rules. The three main guiding principles are that magic should not be something that let's you solve every problem instantly, that they don't completely obliterate the laws of science, and that it should cost you something to use. As long as your power isn't a game breaker and you be careful about god-modding you should be fine.