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The Great Disaster was a battle fought between thousands of Guardians and the Hive to take control of the Moon. Shortly after discovering the Hive on the moon, the Vanguard had ordered a full-scale assault on the moon to establish a beachhead, but the Guardians who arrived fell by the hundreds, as leading the Hive army was the god-king Crota, an invincible knight who devoured the light of the Guardians.[1]
In the aftermath, the Vanguard classified the Moon as forbidden, and not to be visited unless absolutely necessary.[2] One of the survivors of the battle, Eriana-3, swore revenge against Crota and assembled a team of Guardians to enter the Hellmouth alone. Only Eris Morn survived.[3]