I finally decided to do the one quest line I had never tried - the Mage's Guild. I am doing OK up to this point. I am now trying to open the hidden door in Vahtacan by throwing magic spells at the pillar. So far the sequence has been Fire, Frost, and Damage Magicka. Each time the walls have lowered part way. I need one more spell to finish the job. But every spell I have that enhances or fortifies Magicka applies only to myself. What spell do I need to open the pillar all the way? And where can I find it? Oh - I did try a forum search on this one and found no result. Sorry if it is a redundant thread.