The Destiny 2 expansion that introduced the Moon as a playable destination is Shadowkeep. Released on October 1, 2019, it brought players back to Earth’s Moon, expanding the lunar setting from the original 2014 Destiny.
Shadowkeep centers on Eris Morn, who investigates a mysterious Pyramid ship buried beneath the Moon. Her actions unleash Nightmares—manifestations of enemies and traumas from the Guardians’ past. The Hive fortress called the Scarlet Keep becomes a major story location.
The expansion added the Garden of Salvation raid, the Pit of Heresy dungeon, Nightmare Hunts, new weapons and armor, and the Armor 2.0 customization system. It also introduced finishers and seasonal artifacts to Destiny 2.
A common mix-up is confusing Shadowkeep with later expansions. Beyond Light introduced Europa, while The Witch Queen focused on Savathûn’s Throne World. Shadowkeep was also released alongside the free-to-play New Light version of Destiny 2.