You'd need to find the Elven Boots item to stack up to 30% resistances in order to survive an attack from the boss, and even then you'd need 115 hit points to pull it off. That lets you survive a single attack while at full health. Given the whopping hit points of the boss and the fact that you're stuck with purist-level damage, you're going to need at least 12 hits to beat him. Even with a mid-battle level-up you're looking at four hits, then you need to rely on death protection. Even presuming one DP from CYDSTEPP and one from Badge of Courage, you'd need six DP's from unstoppable fury which is an unrealistic amount of piety. On top of this you'd need massive damage and hit points.
I think this is actually into the realms of the impossible; even given perfect resources I don't think this is feasible.