0-4 personally against him. I have to whine and say this mob is entirely too difficult to keep aggro on , even with all melee aa's, ragebearer, 75% haste, and even horrorfying visage buffs. That wouldn't be bad if he wasn;t more lethal then all of the cmalath mobs except the final boss. He is classed as an enchanter? Quads 550~ roughly, above average attack speed, mezes, nukes for 1k, slows 45%, does some other disease hand thing, and dispells all your buffs. Lose aggro and you wipe. And yeah i've tried him with an enchanter spamming 60+ mana drain and he was still casting with 35% health left before he finally got free of aggro and took out the healers wiping us.
I've tried to finess this guy over and over with some of the heaviest raid geared toons on the server and am convinced it is still a luck fight. I don't know another fight on the server where you can go from breezing him to get him to 25% and then the fight totally turn and he completely wipe your party in 30 seconds.
What kind of difficulty rating is he supposed to have as he is merely the third, (of 5?) named in Elthannors Catacombs and getting to him is a cake walk compaired to actually killing him..