Forgotten Deep Solo Expert

Overview

Forgotten Deep Solo Expert is a Triumph in Destiny 2. It requires the player to complete the Forgotten Deep Lost Sector on Expert difficulty without a Fireteam. Completing this triumph awards 5 Triumph Score. The Forgotten Deep is on the Pale Heart, and its enemies carry an Arc threat with Unstoppable and Barrier Champions.

For the same solo run on Master difficulty, see Forgotten Deep Solo Mastery.

How to complete

1. Launch the Forgotten Deep Lost Sector on Expert difficulty and make sure no other Guardian is in your group. The recommended power for Expert is 2040.
2. Bring weapons that match the enemy shield types, and use armor mods that handle Unstoppable and Barrier Champions.
3. Barrier champions: damage them first. When they create a barrier bubble, shoot the bubble with an anti-barrier weapon to stun the champion.
4. Unstoppable champions: stun them at any time. Damage dealt while they are not stunned is significantly reduced, so stun first, then damage.
5. Stuns that work solo: a Strand suspend can disable a group of enemies or stop a charging Unstoppable champion, and a Stasis freeze handles all three champion types. A fusion rifle with Chill Clip is one of the cheapest stun options.
6. Save heavy ammo for stunned champions and the final boss, since heavy ammo is scarce in Lost Sectors.
7. Finish inside about 15 minutes. Revives are limited when solo, and Darkness Encroaching removes all revive tokens around the 15-minute mark.

The triumph's progress advances when the sector is completed solo at Expert difficulty.

Further reading

A video walkthrough of a solo Master run of this sector is linked in the sources.