This Destiny 2 The Cistern, Glade of Echoes, Exodus Black Lost Sectors page will explain where to find all the mini-dungeons within that area of the Nessus Patrol space.
If you want more information on how to find Lost Sectors and the rewards they offer, our Lost Sectors locations page can help.
Destiny 2 The Cistern, Glade of Echoes Lost Sectors
The three Lost Sectors in Artifacts Edge and The Tangle are:
The Conflux location
The Conflux Location: From The Cistern spawn point, go north, keeping the edge of the cliff to your left, following the main path as it curves round. Keeping the cliff on your left, you'll come to a white river and the top of the waterfall, where you'll see the Lost Sector symbol on a square outcrop of rock on the other side.
From here, look to your left, and you'll see a giant tree, but before that, several rectangle platforms leading down.
Head down these, then look back towards these platforms, in the direction of the tree.
You'll see the entrance to The Conflux Lost Sector at the base of these platforms.
Here's the location on the map to help narrow it down further.
Strategy: Head inside, then turn left and drop down. Head past the sunken spheres to your left then head through the opening at the end of this room. Drop down, turn right and you'll be in the main chamber of this dungeon. Time to take down The Cabal!
Deal with the patrolling Scions, then focus on the Incendiors as they can cause you some grief from afar. Warhounds will also be released to your right, but there are five in total, and not hard to defeat in small numbers.
The boss of the level, Primus Cal'aug, isn't too tough but he does have those heat seeking missiles that blind you like flash bangs. Use the cover at the bottom of the stairs to pick him off. Beware of the Psions covering him from the far platforms.
The Carrion Pit location
Location: Look for what looks like a half-crashed ship in the middle of the Glade of Echoes. On the side nearest the entrance to the area, look for a large ramp. On its left-hand side is some torn steel with the symbol on the side. Go past the symbol and immediately turn to your right.
Strategy: Follow the passageway down, then turn left, then left again. Continue through the tunnel, turn left at the end, then turn right. Cross the container-esque bridge in this area, and walk down the ramp towards the blue-lit opening. Now turn left and you'll enter the large, main area.
Take out the Shanks and the Vandals in this first section, and be wary of the one Tracer Shank (we found it patrolling in the upper-left corner from the entrance itself) and a Heavy Shank just ahead of you. It can cause a lot of damage, but isn't very hard to take down since it doesn't have a shield.
Turn left and go up the lit ramp (being sure to put down the Vandals and Dregs to your left before you do. Turn left at the top to enter the final section of this area.
Here you'll find a few more Dregs and Vandals and you boss, a Servitor called Nariks Reborn. It's not shielded, but it does have a tendency to make some of its Fallen buddies immune, so focus fire on it. We used a hand cannon and a super to finish it off.
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The Rift location
Location: This one's really easy to find - in fact, you can see it from the Exodus Black spawn point. It's on the side of a broken, cylindrical container on the far side of the area you're in. Head on down to it, but beware of a Fallen patrol (which may contain a captain) prowling around it.
Strategy: The entrance to the dungeon is right behind the container with the symbol. Head inside, turn left and jump over the metal fence. Go down the blue-lit corridor and jump over another metal fence. Turn left and jump over the stone blocks. Now turn left to enter a large chamber.
This area is full of Dregs and Vandals, so focus on the Vandals as most are armed with sniper rifles and can do serious damage in groups. Even a decent hand cannon works well here. Once they're all mopped up, head to the far right-hand corner of the room to find another entrance.You'll now be a massive, blue-lit shanty town.
Jump over to the right-hand side and you'll immediately encounter the Fallen. You'll find lots of Dregs, Vandals and Shanks, as well as the boss (Talas, Dusk Captain).
You can either use the cover of the lower containers, or, leap to the higher levels and use your elevation to pummel the Fallen below. Beware of some Vandals already placed at this level that'll need taking down beforehand.
The chest can be found on the far left-hand side (from where you first entered the area).