A Single Thread is a Quests added during Destiny 2: Season of the Haunted.
This quest gives access to the Duality Dungeon.
- Acquired from Hawthorne.
Talk to Hawthorne
"Dive into the depths of the exile emperor's mind in search of dark secrets."
- Complete the dungeon, Duality
Return to Hawthorne
"Hawthorne wants to talk to you about what happened aboard the Leviathan."
- Return to Hawthorne in the Tower Bazaar.