Fool Me Once…

Overview

Fool Me Once… is a Triumph in Destiny 2 that requires completing the Dual Destiny mission. Completing this triumph awards 10 score.

How to complete

Dual Destiny is a two-player exotic mission in the Pale Heart. It cannot be started solo. To unlock it:

1. Complete Overthrow once in each of The Landing, The Blooming and The Impasse.
2. After each Overthrow, find and kill the Secret-Keeper Hive Witch in that area during the cooldown. This can be done solo.
3. Follow the green light in The Blooming to the boss room at the Pillar of Silence.
4. Defeat the Expectors Selin and Yemiq near Ikora's crashed ship. Guides differ on this part: one describes killing the Subjugators that spawn in the Refraction and collecting the orbs they drop.
5. Carry the light and darkness orbs back to the boss room and place them on the matching plates.
6. Once the orbs are placed, the mission appears on the Pale Heart director map.

Partner

You need one player with a Light subclass and one with a Darkness subclass. Prismatic characters are assigned an alignment at the start. If you have no friend to play with, use Fireteam Finder under Other, then Exotic Missions, and select Dual Destiny.

Rewards

Completing Dual Destiny gives an Exotic class item for the class you are playing: Relativism (Hunter), Stoicism (Titan) or Solipsism (Warlock).