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, although with a title as dignified as this, it is likely that the being in question is a Prophet or a high ranking Elite.

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

Trivia

 * It is likely that this individual's name is related to the Forerunner Crystal, a mysterious Forerunner artifact pursued by the Covenant during the events of First Strike.
 * It is also possible that his name was related to the Activation Index, although there is no other evidence that the Covenant knew of it before the events of Halo 2.