IMO best combo for survival mode thing is Cleric that u specialise full endurance, then health and mana regeneration heavy armor, One ranger half dextirity half intellect and other full dextirity, and one conjuror full intellect, the intellect ranger should focus on lethality/stuns while dextirity one on plain damage, the intellect is for the healing eac round thing to do as muchas possible, this way you can pretty much keep survival up untill you get bored (Y)