Swirling Fog Elemental  

+ 762.72, - 468.59, +64.05

There are five or six elementals in the round room past the flying monkeys. Easiest way we found to take care of them was to start one room over (3 mobs: cheerless apparition, ghostly vision, and mournful soul). If you tuck up in a corner you can pull two, kill, then pull the last and kill. From there, you can pull from the elemental room, one or two at a time, and work your way inside. Once inside, we tucked up in a corner behind the trapped dream to wait for the respawn.

Amazingly, the named popped after the first clear, but we had the second round right behind it, so ended up staying and finishing off those as well.

There is a nightmare guardian that wanders in and out as well.

Dropped Belt of Heavens and a shard.