Zeph may have been 37 at one point, but no longer. He's LB to my 61 SK and very magic resistant. Not a single spell except Drain Soul Lifetap landed and that one was below 50% effectiveness. Even Harm Touch did a whopping 5% damage. Between the dodges and parries, I did almost no melee damage to him. I burned multiple potions to get him down to 70% and finally whipped out my Worker Sledgemallet to gate out of there when, OOM and on a long potion timer, I dropped below 30%.
Gotta bring some help with me next time.