Elysium City, the capital of Eridanus II, prior to being glassed, c. 2517. (Halo: The Fall of Reach/animated series)
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Sometime in 2530 the colony world of Eridanus II, home world of John-117, was glassed by an unknown Covenant force. It is unknown whether the UNSC was able to put up any defense of the colony.
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These events are referenced in the novel Halo: First Strike.