I've finally come face to face with Cet, and don't seem to be able to hurt him in anyway. I've saved Kerah, and found the keys to Cet's lava cave. He seems to be invincible. How do you kill him?

Previous post say you can only damage him with the Mavin sword or the Lich's staff, (replenish both in the black fire). By the way where did you find the second tablet in the underground city I have #'s 1&3.

Thanks. I've been trying the Mavin Sword, but I didn't "replenish" it. I don't remember where I found the second tablet. The only one I remember is the one that requires the two doors being open and the two levers turned. I think that was the third.