Well He's 35 to 37 level wise...
Procs, not casts a Pillar of Ice line of Wiz Spell. You'll notice a blueish pilar of smoke around you with the proc. its pretty hard hitting 600damage or Nada. Trick is seems this guy procs whether he hits you or you hit him, and no even with a weapon he procs. I think this Proc is a Deadly Cross between a necro's Vampiric Embrace and a Wizards Pillar of ice line of spells. Very powerful and almost unresistable. Lets just say a level 60 warrior best have his Coffin size lined out before taking this guy on, cause he procs from the get go. 100% hp and procs, I've killed it 5 times looking for the Kly and the helm for the decent ac for a guild mate. Never seen overseer drop anything more than Normal Kly loots tho, normaly only a few coins.
resist buffs, and items not going to help you here. with 140 resist Cold with Full Vox Gear on it still did full damage and only resisted it 2 times out of 6. and at 51 I died in 4 procs thats 2300hp.
Best method of Dispatch is to clear the path from water to him, Snare pull, Dot him and Nuke/DD till he tries to gate *And he will try to gate onces he's at 1/4 hp left. Chain stun from 50%hp till dead, and make sure you just kite him around the water area and use the Pathing to keep him off you. Not to bad really this way, but gated on us once which makes it very tough. He's got good resists himself as wel does The Kly.
Rahnaan Dal'Sahr
51 pathfinder
Brell Serilis -- Circle of Rings