Ok, did him again. Spawned about 6 minutes after the first one died and dropped my sleeves. Again max hit 165 and I did go defensive. Pet remained at 100% and I dropped to 70% (5.5k HPs) Quite easy.
Ok, 65 BST just solo'd him pretty easy. He was in the room north of the invis wall. Was hoping for him to drop arms but dropped veil. Didnt heal pet once, max hit of 165, went offensive and did paragon myself. I let pet tank the beginning and he dropped him to 47% by the time pet had it at 75% so I stepped in. Very easy.
Root-rotted this guy - had about 15k hp, did not cast, did not summon. I don't know how hard he can hit, since he never got the chance to swing at me. Overall, about the same level of difficulty as the acolyte placeholder.