Its Side-quest Time! Black Omen - Use just magic attacks against these guys. Obviously with Defense like that your regular attacks aren't going to get you very far. All of its attacks are insanely weak. You really shouldn't have a ton of trouble with this guy. Just be sure to heal if Life Shaver gets used by the Lower Body. The lower half should be killed off quickly, making that an unlikely-to-see attack, but you never know.