I had a fighter/cleric once .. he could achieve near-immunity to all physical damage and healing-immunity ( above 100%, which is what your Wizardslayer-thief is going to get ) to blunt damage. Kinda fun to challenge one of the last bosses who is hell in melee and get healed every time he hit me
I'll try to dig up the post concerning the wizardslayer-thief immunity; equipment and such .. might be spoilers inside, but I'll warn you [img]smile.gif[/img]