I know there are a few left who still need to complete, so I figure our strategy might help some. Before you start, stack up on bulletcakes and make sure that you have AT LEAST one arc and one fire weapon. The shank shields will only drop from fire, and the fallen only from arc. Take your time with this. A wipe means you restart from the beginning, so don't ever run out from cover and always have someone out of combat to revive. Taking your time is faster than constantly reviving. A. Classic line was coined by my fellow fireteam member Betrael during our run. "Take your time, there's a Dreg." Sounds silly, but you understand if you have run it already. Also, try to save your supers for tough spots or elites just in case. Once you get in, kill the trash mobs outside to make sure you are full up on ammo. When you get to the mesh generator, trigger the event and go back to the beginning of that room, the enemies won't leave, letting you take your time and pick them off safely. When you get to the devil walker, move slowly up the left side, clearing all trash mobs as you progress, when it's clear, run into the room to the left of him one at a time, leave one person up the stairwell well out of splash radius to revive and slowly edge out of the stairwell. You can shoot his left legs without being in his line of sight, go up the stairwell when he fires his main or secondary guns. It's a good best practice whenever fighting him to take his missle turret next to his head down before focusing on the legs. If possible, take it down after clearing the weaker enemies before rushing the stairwell. For Sepiks, immediately run into the room to the left. Have one person at the window, one person at the stairs and one at the bottom of the stairs. Clear the trash from that room and slowly chip away at sepiks. Whoever is on bottom needs to watch for groups moving in. Save your supers for if they push to the stairwell. Clear all adds before attacking Sepiks. He spawns adds when his health drops to certain points. Eventually, he dies and you win. Make sure you are always in communication with your team, revive as soon as someone goes down, cut the pie, etc. Happy hunting dudes. If this was helpful Ill do one for the next nightfall. Maybe it will become a weekly thing from Primeguard.