Rimon 'Achachakee was a Sangheili member of the Covenant, eventually rising to the rank of Field Marshall by 2552, commanding the entire Covenant Army during the Fall of Reach, and then managing the Asian Theater during the Siege of Earth. In 2537, he was chosen by Ameigh Broley to become a member of the Lance of Unrelenting Reparation, which he served in until his promotion to Sangheili General in 2548, when he left to command the Third Army of Infinite Might under Field Marshall Sarzav 'Oonskee.