This guy does have alot of hp and I agree his pre-sieve spells do cause alot of trouble but the thing thats most hard about him is his huge hp regen. I killed him the other day and while our main tank was charmed he killed most of our main dmg dealers till the irresponsible enc cancel magiced him and during around 10 minutes as we were rezzing he gained 10% hp and we still had around 5 melees beating on him. I tanked him for a while and as a paladin with 1200ac he doesn't do too much damage and with 2 great or 3 good clerics you can easily switch and constantly Cheal when needed on a good tank. btw with 14 people at an average of lvl 55 we killed him in an hour. his hp regen is HUGE and a correction on the stats on the robe that someone posted up there... its ac18 15int 15sta(instead of str) and 100cha. As a last comment it is necessary to have a high lvl shaman (we had a lvl 60) to slow because when slow wears off you die... and die quick.
"It is not the equipment that makes the man. Its what you do with it."
Ainadak Felblade 58th Knight of Veeshan