I setup camp in the room before Traydan Faye. I cleared that room, the room before this room and Traydan's room, except for him.
After clearing those, the rooms respawned and did it again an again.
30 kills into it I got the Gleaming Hoop of the Silverwing which is the 10th piece and requires no combine. 50 more kills and I got the Shard.
2 and half hours to kill 80 mobs and I'm done!!!!!