Only 1 boss surrounded by 3 Drakes and some trash. The Drakes drop badges if you kill them individually, or epics if you fight them at the same time as Sartharion.
SARTHARION
http://uk.youtube.com/watch?v=cRARJSTEE6g&eurl=http://www.tankspot.com/forums/f206/41777-obsidian-sanctum-sartharion.html
SARTHARION
http://uk.youtube.com/watch?v=cRARJSTEE6g&eurl=http://www.tankspot.com/forums/f206/41777-obsidian-sanctum-sartharion.html