i thought of an idea that would make you able to master all magic skills.
1. start out as a good person. Master all of your good guy magic skills.
2. get evil. (many ways)

one of the faster ways is to go into bowerstone south at night. there, kick a sleeping homeless girl. if you kick her into a corner she can't run to the guards and she can't die. i love that way

remember!! this is only a theory and has not been tested by me yet.