If you want to be flat out broken, play a tanky AOE CC wizard. You'll need difficulty mods to make it exciting.
I'm assuming you mean the Arcane Warrior/Blood Mage?
Put all your points into Magic and Constitution, only increasing your willpower to cover your sustainables, and sprinkling a few in Dexterity (if you need more +attack). Grab the core sustainables--the first three skills in the AW tree, Rock Armor, the second shield in the Arcane tree, Fiery Weapons, Haste, Miasma (I think that's all). Death Magic or the life syphon sustainable recommended.
You now have a Mage clad in the heaviest armor the game offers, which lets you (with your sustainables) cap your damage mitigation and defense (you almost never get hit, and only for negligible amounts). Toggle Blood Magic on and off to access Blood Wound (nothing else matters). You are now locking down whole rooms of mobs, killing all the lesser ones outright, with one spell. Your auto-attack does more than enough damage to kill everything left quickly.
Hilariously broken. Even more so if you port it to Awakening. Battlemage/Blood Mage/Arcane Warrior was LOOOOOL.