Play a mage with piercing rod? Short of worshipping Mystera Annur and wiping resistance, there seems to be no viable way to play a non-warlord melee class in dungeons that feature two bosses, each resistant to a different flavor of damage. Melee lacks a tool like the piercing wand, and i find unless you have immense durability (warlord) it's nigh impossible to kill some of the bosses in this game. There's the really big sword, but not only is the passive crippling (especially to the low durability, high damage classes that need it the most [rogue, assassin]), but it doesn't even grant full damage penetration.
Am I missing something?