From what I have heard you can access master level illusion spells by completing tasks for drevel? at the college after you reach level 90 in illusion. Well I am level 91 now in illusion and he still isn't offering me any missions or the more advanced spells for sale. I have completed the main mage college quest. Does anyone have any ideas?

http://www.uesp.net/wiki/Skyrim:Illusion_Ritual_Spell

Says there required 100 illusion.

Don't sweat it, they svck anyways. you may need 100 skill, that is when I did it though maybe I could have done it earlier and just did not notice it. They are literally just worse versions of your expert level spells.

Thanks, that explains it. I bought some spells from him before I hit 90 so according to the bug he won't offer the master ones until I get to 100.