You should have mages with some form of crowd control; the more the better. Awesome crowd control spells are: Sleep + Waking Nightmare: Cast from a distance and watch as chaos reign. Crushing Prison is another great CC by itself. Force Field quickly takes out a target temporarily. Glyphs and Hexes are also a must. Healing spells are crucial. Of course, damage spells are also needed, but a balance of both will get you through normal easily. You shouldn't need the consumables unless on tougher bosses.
