From Halopedia, the Halo wiki
Elegy's Lament is an SDV-class heavy corvette that was captured from the Covenant by the Banished at some point after Atriox led the group in rebellion against the empire. Atriox commanded the vessel himself. In the wake of the Great Schism, a unit of Special Operations Sangheili called the Silent Shadow infiltrated the ship with the intent to massacre the Jiralhanae that crewed it. These four Sangheili were able to kill at least five Jiralhanae before an alarm was triggered and Atriox became alerted to the hostile presence. In the end, instead of completing the slaughter, three of the Silent Shadow turned on their leader, Resa 'Azavayl, and joined the Banished instead after an offer was made to them.
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