Oh, I'm wearing -75% robes and some other clothes to bring costs further down. But dual-casted fireballs or chain lightnings are still very expensive. The modifier is 2.8 I think, but I tell you, a dual-cast fireball really smashes almost everything in the game. I blast away Draugrs with just one of them.
With 100 enchanting, +enchanting potions, and crazy +enchanting items, you can get up to 100% off on destro robes, which means you can infinitely cast master level spells with no mana loss. It's not even gamebreaking on Master.
