I've tried to join the College under the Illusion school. The first time, I backed out of the conversation before the wizard lady elf could sell me a copy of the spell book I needed. Now, every time I try to join the Illusion school, it defaults to Destruction. My Magicka is at 160 and I'm a level 18 Dark Elf. Is there a bug or is my Magicka not high enough? I have no idea what's wrong.