Hidden Thorn

Overview

Hidden Thorn is a Triumph in Destiny 2. It requires defeating 10 Nightmares on the Moon while the Exotic weapon Thorn is equipped.

How to complete

1. Get Thorn. It returned in Season of the Drifter through the hidden quest "Independent Study". Since Beyond Light it has been obtainable only from the Monument to Lost Lights.
2. Equip Thorn as your active weapon. The triumph counts only kills made while it is equipped, so swapping to another weapon stops progress.
3. Go to the Moon and defeat Nightmares there. Nightmares spawn in the open world, so you can die and respawn to keep fighting, as long as you defeat each one before it despawns.
4. Keep going until the counter reaches 10.