From Dungeons of Dredmor Wiki
Do magic skills require a granted ability column? All levels grant a spell which is usually activated. Nothing passive I think. /Zzinged 10:31, 18 July 2011 (MDT)
Except this one, and some late levels of Necronomiconomics, which both grant resistances, and maybe some others I can't think of right now. OTOH, I'm replying to a six-month-old comment.
 Obvious Fireball use
Worth to note that the fireball is a shot projectile and can get stuck along its way to the targeted hex. Be cautious.
 Rune of Exploding exploding under my feet!
It is worth noting that Rune of Exploding can be triggered by the player as well as by the enemies.