Guardian of the Luminous Key

"Damn silly name."

- Avery Johnson

The Guardian of the Luminous Key was a member of the Covenant whose arrival in the Ascendant Justice was awaited by the Covenant forces stationed at Alpha Halo. He was briefly mentioned in a Covenant message translated by Cortana. . Interestingly this specific being was never mentioned.

It is likely that he or she was killed either by John-117's boarding party, Cortana depressurizing a significant percent of the ship, or the ship's eventual destruction.