History of Treasure Key

The Treasure Key is an item earned by completing a round of Dares of Eternity; it opens the chest in Xûr's Treasure Hoard in Eternity, which holds weapons and armor from the 30th Anniversary event, and unlocks cosmetic chests in the Treasure Room. Each successful run also awards a Strange Coin and Legendary gear. It features in the Eternity Beckons quest step of Season of the Lost.