I spent some time in this room trying to get the cloak this guy drops.
The mobs in the room are on about a 20 minute timer, and this guy appears to spawn on every 4th cycle. However, like alot of spawns, there is obviously a time thing on how long between spawn kilss cause a group of us kept about 1/2 the caves clear one nite and he never spawned tho we cleared this room numerous times. When he has spawned for me it has always been working my way methodically round the room.
At 63/64 this room all con Lt Bl and are easy with dog and me. Their aggro range is small and, apart from the pather in the pool, you can walk through the doorway without getting aggro.
I killed the dedicant 5 times before getting the cloak so I believe the "common" tag to this drop is wrong. The other 4 times he dropped the Medallion - still nice but not waht I was there for.
The main thing with soloing this camp is making sure your pull area for this mob is clear and going to stay that way. I got killed when the pather joined in once (hard to cast when 2 mobs are beating on you).