Okay the first boss does 36 (half of 75). You do 105. Hit him as much as you can and then regenerate till you can tank another shot. Assuming this is 4 tiles (5 maybe) he heals 40. You hit him for 105 and deal a net damage of 65. Repeat this technique till he dies. Save 4 potions for the dragon elites, and with enough regeneration, piety, and 2 altars you can desecrate--50 piety for another unstoppable fury--you should be able to pull it off. Also, with the new elite items added if you bring an orb of Zot with you berserker camp is a breeze. (Orb lowers max hp so he can't regen until he's halfway down and it lowers his berserk %)
We made an expansion and it is awesome. Really, you should check it out, especially if you're looking for some extra challenge.
Download over at ddmod.weebly.com!