The Destiny 2 Horned Wreath collectible is tied to the Essence of Vanity quest and the Tranquility sniper rifle, and it actually matters nowadays since Moon weapons like Tranquility are once again dropping at current Power levels now that they've been un-sunset. The Horned Wreath is tucked away on the Moon, and it hasn't gotten any easier to find since Shadowkeep first came out, so here's a quick guide on where to find this squirrelly little thing.
How to find the Chamber of Night
From the southern landing zone on the Moon, head west and then take the right fork up a hill toward an abandoned research station. For Destiny 1 veterans: this is the spot where you first hear that "we've woken the Hive."
Head into the temple and keep descending, following the fairly linear path through the Hall of Wisdom, until you reach the Circle of Bones. You should see a large light in the distance when you emerge. That light indicates the doorway you need to take. Head through it until you reach the World's Grave, then look for the main room where you fought Omnigul in the campaign. Take the right alcove into the Chamber of Night.
Alas, we're not done yet. The Chamber of Night is long, and the Destiny 2 Horned Wreath is in the very back. Fortunately, the path there is basically a straight line. Just keep moving until you reach a large open chamber with a massive skeleton in the backdrop. This room may or may not be guarded by an Unstoppable Ogre, and if it is, you may want to kill it, as the Horned Wreath is right by it. You'll find the Horned Wreath on a small pile of rocks which should be marked by a waypoint provided you have the Essence of Vanity on you.
Quite a trek, eh? To be fair, this may or may not be the shortest path to the Destiny 2 Horned Wreath, but it is the simplest path. The good news is that after you collect this thing once, you won't need to do so again. Enjoy your Tranquility grind!
Destiny 2 Necromantic Strand | Destiny 2 Fangs of Shun'gath | Destiny 2 Captive Cord | Destiny 2 Ehrath'Ur's Horned Wreath | Destiny 2 Withered Plumes | Destiny 2 Bound Manacle | Destiny 2 Ethereal Charms | Destiny 2 Ralnik's Hatchet | Destiny 2 Tips | Destiny 2 Crucible tips | Destiny 2 Class guide | Destiny 2 Heroic Public Events | Destiny 2 Aspect of Destruction | Born in Darkness Destiny 2 Beyond Light guide | Destiny 2: Beyond Light Entropic Shard guide