We took him down very quickly with a group of 56 Cleric (me), 55 Rogue, 65 Beasty, 65 Chantress, 65 Ranger (did NOT have TS up), and a vbery nice bard I think was also 65. With bard resists, we were all around 300 MR and his lifetap never landed. With that out of the way, he fell before I had to heal at all.
Prior to the Bard's arrival we lost with a group of 5 becuase his damage took me by suprize. He had been hitting for nothing--around 70-200ish. Then all of a sudden, he got good and I was a bad cleric--he landed a double 440 on our BL followed by a tap and my CHeal was too late.
Moral of the story, use fast heal and get your MR high.