Broke this room up. Not easy but did it myself 4box combo all 88. Warrior Enchanter Cleric Wiz + merc tank and cleric.
1) Positioned Warrior in door to pull bone golem.
2) Stuck enchanter into corner of room near quest mob and end of the ramp leading up to the room. You can then see the adds to target and Calm them. I calmed 2 on quest guys side and two on other side I could see. Be quick casting.
3) Pulled bone golem and only got 2 adds. killed them and door mob respawned. Killed all 4.
4) Moved into room and ran over to turn in for all 4, healing merc tank and mezzing with chanter while I finished turn in and hails. Not very clean but doable without a "super" group.