I killed this guy twice yesterday soloing with my 53 mage. Everything in the room conned light blue. I think he pops when you clear the room. At least that is when it happened for me both times. Watch out for his death walk. Its more like a run and was not responding to pet's root spell (or pet was OOM). In one instance he was running out of the fort to agro other mobs with like 3% health. But pet took him down at the door! I sold the sleeves quick on Morelle-Thule for 1500pp in the baz. I will ask for more next time.