Eh? o_O?
Why even bother to fight with him?
I used a spare scroll of Time-Stop so that the mage who cast it could waddle over to the altar, place the three items and hola!
Suneer, Golem, Demon, meet Avatar.

Avatar, please kill them.
Here's a recent example I happened to screenshot
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If not a Sorcerer, then a Paladin.