In that case, I recommend switching to a half-black dragon war troll, and grabbing those levels Bone Knight. Since you're going somewhere paladin-y, I would also recommend being a Cleric/Prestige Paladin and grabbing Battle Blessing, because you're going to need some serious shenanigans beyond just being impossible to kill in order to be competitive. Seriously, immunity to damage isn't going to cut it with that wizard in the party. Just don't mention Planar Bubble (Far Realms) (which would grant said wizard 100 turns to your 1).