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He's in the mid to south area of Bethlusaa's Lair beyond a red door.
Attaching a pic where he is. Yes, I'm the head of Zarista Games. He's in Bethlusaa's Lair. I'm not sure where you are.
I misunderstood you. My fault. Directly to the north of the Disgraced Knight, through the gate you can see in that pic, is a column of fire. Tap it.