All Hunters, one tether and two Celestial Nighthawk. When you first encounter Omingul, have someone shoot her with sleeper stimulant to take out her shields. Then the Nightstalker shoots the tether near her, not on her. This is so it tethers the knights and thrall that will spawn near also. Both Celestial Nighthawk runners pop their golden gun and jump in the air for the hidden perk to activate that causes bonus accuracy. They shoot and it should insta kill her. Kill the thrall that are still tethered for orbs and then everybody must die. If you miss a shot, everybody must wipe there, do not attempt to kill her because you will fail. [spoiler]if you still don't know where I'm talking about, it's where you first engage her.[/spoiler]