The Moon (also known as Luna) is Earth’s only natural satellite. Like most of the celestial bodies in the Sol System, the Moon is littered with the ruins of humanity’s Golden Age.
After the Collapse, the Moon was occupied by the Hive lead by Crota, a Hive Prince and son to Oryx, The Taken King. Up until the rise of newer Guardians in the Age of Light, countless Guardians were slain in their attempt to reclaim the Moon from the Hive. Most notable occupations against the Hive included the Battle of Burning Lake, the Great Disaster, and the failed mission of Eris’ Fireteam.
During the Age of Light, Guardians managed to establish control over the Ocean of Storms and eventually destroyed Crota. This caused Oryx, The Taken King, to arrive in Sol to attack the Guardians and the Traveler – which was ultimately thwarted by Guardians during the Taken War.
During the Red War when Guardians lost their light, there had been significantly less Guardian Presence on the Moon, allowing the Hive to re-establish a foothold over the region once reclaimed by Guardians. Following the discovery of a new fortress near the Hellmouth, the Guardians made a return.
In doing so, they discovered a massive black Pyramid structure beneath the keep, unveiled due to the recent Hive activity. Some of this dark power swept through the Solar System, creating Nightmare phantoms that took on the form of the Guardians’ worst foes. Further complications arose, with a signal being sent from the Pyramid to the Vex Black Garden, causing the Vex to invade the Moon. This was eventually stopped when Guardians infiltrated the portal network with the help of Ikora Rey and the Tower and killed the Undying Mind, the root cause of the attack.
Nowadays, a Hidden Swarm under the control of Xivu Arath, The God of War, has been active and causing disruptive activity on the Moon and beyond. Osiris had attempted to stop this, but his Ghost Sagira was killed in battle, and Osiris was forced to retreat.