"THE OVERLORD" or "HIGH CHIEFTAIN" or even make it better and have "The Counsel of ELDERS", which would consist of say 12 suped-up Archon Priests. As you enter the Chamber you find all 12 in some sort of stasis. You would then have 4 waves of 3 Elders to deal with. Each with their own tatics and fighting style. Then make the encounter even more fun by making it random on which 3 wake. In addition each Elder would have different medieval weapons with different abilities.
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Bruh that would be dope as shit. Dat be da bomb