Took about 15 min with ml9 ench, menta and druid. He hits for about 450-1k dmg. The laser does not much dmg and has a low area effect. The 2 guards at the entrance don't help him but he threw my menta to them after 5min fight.. instant dead. He also switched aggro on my ench after a few minutes of fight but soon attacked my pet again.
We beat him with 7 people Blademaster Hero Champion Animist druid Warden bard
Took about 10-15 minutes to drop him. I didnt have any problems with the Laser that shoots out of his eye. Only thing i'll tell you is that if you are the one taunting it and get tossed up on the walls, make sure your healers are running in circles and bard heals. That way he will pick someone else to hit after a bit. Real easy to do if you know what your doing :).
You need a 50+ group to kill his ***, you cant focus him and just need to old school meelee, he does far to much damage to heal just rez when people die. If you know your gonna beat him his life should go down consideribly fast, if hes not visibly dieing in under 10 mins your probably gonna lose, other then that great drops.
Note: watch out for his eye lazer beam, it shoots thru walls and is uninteruptable, and will kill anyone in 2 hits or less.