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This Arbiter was a Covenant commander during the Second Battle of Harvest in 2531.

Biography
Before his appointment in 2524 (by Human reckoning), the Arbiter was once a regular soldier and an effective one at that. "Evil and angry" however, he was imprisoned for crimes against the Covenant, his penchant for violence too great even for his superiors' tastes. However, he was appointed to his new position, tasked with eradicating humanity. He was tasked with this because the Hierarchs wanted a leader that didn't ask a lot of questions.

Although the Second Battle of Harvest having concluded in the UNSC's favor, only "shadowy information" was retrieved on the Sangheili commander. The Arbiter was present in Harvest's northern polar region, his task close to completion. This involved overseeing excavations of a Forerunner relic. Dismissing concerns from his comrade Zealots, that the relic could be defiled by "the infection" (possibly refering to the Flood), he ordered that the relic be opened. Gathering useful information, the Arbiter alerted the Prophet of Regret to the situation, that the Humans were closing in on their location. Regret thus ordered that the Arbiter return to the Covenant and destroy the relic, the Arbiter bowing to the Hierarch's orders despite his initial objections.

Trivia

 * The Arbiter appears as a Hero Unit with a special ability called "Rage mode," which allows him to kill several nearby enemies with his Energy Swords.