If you're trying to work through the Black Armory raid challenge in Destiny 2, then congratulations for signing yourself up for something that's going to require a lot of biting back curses and internal screaming unless you're equipped with trustworthy mates. Actually bum-rushing through Scourge of the Past isn't hard at all, but it's the Destiny 2 All for One, One for All challenge that requires an unhealthy amount of coordination. We'll give you some tips.
Destiny 2 All for One, One for All Guide: Black Armory Raid Challenge
The challenge name obviously comes from the rather overdone Musketeers motto, and it sounds easy enough to accomplish if not for the fact that you've got to coordinate an entire group and corral them into fetching one of each symbol during the fight.
Our tip for this would be to set up 2 teams. You're going to want to rotate your teams through acquiring the buffs. We're going to refer to them as Team A and Team B.
Team A should abseil down and get buffed up first. Once everyone on the team is buffed, Team B (who stayed on the surface), have to kill the Servitor to clear the way for Team A. Then, Team A rockets out of the hole and deposits the buffs in their corresponding areas. For those who need a quick visual guide: the square is on the left, the circle on the top, and the triangle on the right.
Rinse and repeat this process, and a tank will spawn eventually. You also have to keep an eye on the amount of damage actually being done to the boss. You can't just leave them for dead if you want to get the achievement: put the breaks on after the first wave so you're not dipping them too low.
The last time that Team A is heading down the hole, they have to be sure that they're not picking up buffs that they've already had. Someone should keep a running list. Third time's the charm here, so once those buffs have been fetched, the tanks in the encounter will hit the 50% charge mark.
Now, you swap to Team B and they have to go down into the hole to repeat the process. Keep doing this until three tanks have spawned in total, then finish off the boss to complete the Destiny 2 All for One, One for All challenge. It just requires your mates to actually listen to you and to keep a tally of what they've done, because you're not going to be told if you've messed up or not until the whole encounter's over and you're left standing there with your guns in your hands and no reward. Need our tips on anything else? Check out our Etched Crystals Destiny 2 guide for help with getting The Last Word.