Professor Skalvar
General of the Euphoric Gentleman's Club
So I just decided to do some experimenting with the Secret of Arcana power you can get from one of the Black Books, which I believe was Filament and Filigree (anybody is welcome to correct me on that if it is wrong). When activating it, spells will not cost any magicka for 30 seconds. I realized that I had a Telekinesis Spell Tome in my inventory. Decided to read it and add it to my list of spells. Once I activated Secret of Arcana, I casted Telekinesis on a Bucket. My Alteration skill skyrocketed as fast as hell within what should have been 30 seconds. Based on the results of the experiments, I believe that the Secret of Arcana will never run out as long as you cast a spell with a duration cost. After 8-15 minutes (rough estimate) of holding the trigger down, I went from 20 to 100 in Alteration skill. So yeah, this is a cool way to level up Alteration should you ever need to for any reason.