I soloed all the way to this mob as a 75 druid. There were 4 mobs total in the room all Nihil types. I ran to the opposite side of the room and pulled the named with Hand of Ro and hoped I didn't aggro them all. I aggroed the name plus 2. I killed the trash first and then focused on named. The named was crazy resistant could only get Vengeance of the sun on him no magic dots stuck, and fire nuke equinox burn wasn't sticking either. So at this point I'm getting LOM, and didn't have a chance to get more debuffs on him so i switched to Rod of the Ruined to add dps. Procs from that with the dot and DS killed him.
Just spawned this named in second room on right ledge. Approx 740 -955 was able to track from entry in left corner after killing 20 plus mobs...dropped mask listed above...