Far Sight Lost
From Halopedia, the Halo wiki
Far Sight Lost was a Covenant Destroyer, part of the Combined Fleet of Righteous Purpose. In November 2552, it was sent on the mission to Onyx with the Incorruptible's battle group. It was commanded by a veteran Elite Ship Master named Qunu.
When they arrived at the Human-colonized Onyx, the Far Sight Lost was sent ahead of the fleet as a communication spearhead and tried to make contact with the Onyx Sentinels in orbit around the planet, using a channel once used by the Forerunners. The Sentinels responded in brevity by destroying the Far Sight Lost with ease.
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