Just a tip for some people that don't have it yet, make sure you have a team of 3 with at least one tether, a bubble, high impact snipers, and a Raze-Lighter (not required, but highly reccommended.) Spawn the boss, then tether and wreck her with your high impact snipers. No matter how much damage you do, you're not gonna kill her, we had a team of 3 all over 307 with 1000 yard stares and we didn't kill her right as she spawned. After she teleports, go back into the small door/entrance to the final room, pop your bubble, and camp that for the entire encounter, pop out a little bit to kill adds. If you damaged the echo enough on the first DPS, the blight caller will come to that door, and the person with the exotic sword can go one shot her. Alternatively, all 3 people can DPS if there's no solar sword on the team.