From Destiny 2 Wiki
|Description||Historical data preserved as luminous matter. Valuable to those who study humanity's past.|
|Source||Reward for Xûr's weekly quest Xenology and the Exotic Archivist Triumph. There is also a single Exotic Cipher in the Season Pass reward track.|
Exotic Cipher is a Currency Consumable.
This item is a reward for Xûr's weekly quest Xenology and the Exotic Archivist Triumph. There is also a single Exotic Cipher in the Season Pass reward track.
The player can hold only one Exotic Cipher at a time.
This item is used to buy certain Exotic Weapons from previous Seasons at the Monument to Lost Lights terminal. These weapons cannot be bought if they are already unlocked in the player's collection.
It can also be used to buy Hawkmoon, Dead Man's Tale, or an additional Exotic Engram from Xûr.