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.

[edit] 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.

[edit] 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.