Good luck!
We used 1 fighter, 2 clerics, 7 mages.
It should be a lot easier now though and that many mages is probably overkill, since +9 weapons are more readily available, and with 7 Int built mages, using random weapons, there was already plenty of extra time on our better rounds.
Rewards are a few piles (4-6) of 10 varied T3 materials, and a chance at getting various T2 potions. (From 40 reward boxes)