Ikora has asked you to report to the Moon and destroy the Vex spilling out of the Black Garden.
Requires completion of the first mission of Shadowkeep available to all players on the Moon, "A Mysterious Disturbance."
"Scanning Vanguard databases for relevant excerpts about the Black Garden… 'There are gardeners now. They came into the Garden in vessels of bronze, and they move through the grove in rivers of thought.'" —Ghost
Legendary Quest Step