My two cents aint worth much but... Spent 2 nights following videos and forums posts, I did... . Three individual type kills (void, solar, arc) (within 10 secs). Changed up order, did it within 10 secs, etc...No joy . Reduce their health then take out all 3 quckly (1 try within 5 secs 1-2-3 dead, other gos differing times) . Sword only kill all 3 within 10 secs, and 8 secs, no joy .COULDNT do the single super as a voidwalking warlock- nova bomb is one time all or nothing and try as I might I couldn't herd the bastards together. .Last night tried several different approaches and then got pissed off going back to orbit so just sat on the pedestal in front of the door while I rolled a smoke waiting for them to respawn, hoping they'd do it in one place and I could nova bomb their asses. missed the spawn so started reducing their health with a no type gun, had all 3 below half when one cornered me and was about to kill me so I had to kill him and run for the others figuring 10 secs.... Finnalas Peril handgun (no type) all the way on 1 & 2 with nova bomb on last one cause he was dodging my shots..1st actual kill to last probably about 6 to 8 secs. DOOR OPENS I GO IN ECTHAR DEAD WITHIN A COUPLE MINS EASIEST PART OF MISSION WTF IS UP WITH THE DOOR?????? My point is that all the videos and forum posts show that different approaches work but not every time. I don't know if there's an randomness element in the programming like engram drops or some such techno piece out of my understanding but I did every thing suggested and then some and in the end waiting and almost screwing it up is what finally got me in.