Tactics for Diablo (spoilers, obv.)

[MongoJerry]

Oddly I didn't see either of the fire attacks people are describing (circle or fire pools), I did see the DoT one, Bone Prisons, and the lightning breath. Maybe he doesn't use those two in normal. I DID notice Ice Armour was perfectly capable of chilling/freezing him. Hadn't remembered Frost Nova (although I do have Teleport and Diamond Skin as MJ suggested.)

Frost Nova is fantastic for Diablo. It's not normally a part of my build, but I always switch it in against him.