In addition to the listed description of how to get to him, the actual /loc is 1080, -225.
As stated in other posts, when you aggro him you get many adds from the surrounding area. Assist range in this entire zone seems large, but this guy has loads of friends who come help. HPs are approximate due to the size of my final nuke (105 wizard), but he appears to have 450 - 500k. Couldn't tell what he hits for. I killed all eight of his friends first, leaving him for last, and the combined lot of them didn't eat through my self rune (Armor of the Codex Rk. II).