Kholo

Kholo was a UNSC controlled colony that was glassed in 2539 during the Human-Covenant War.

History
In the early years of the war, the Covenant attacked viciously and without mercy. Kholo was largely ignored in this early stage, until an unnamed Shipmaster found a freighter that hailed from the world, interrogated the pilot, and found the coordinates. After receiving holy approval from the High Council, he ordered a scouting force be sent to the human freighter's home system.

Covenant Attack
Kholo's defenses were considered weak by the Covenant, and the scout ships were able to inflict considerable damage before the main fleet even arrived. The Shipmaster was accompanied by the Prophet of Conviction, a San'Shyuum sent with him to complete a particular holy task. After removing the final layers of human resistance, the Shipmaster was given the command to glass the world, albeit in a special manner. Manually controlling the cleansing beam, he fired upon the planet's surface, etching a Covenant symbol into its crust, the symbol meaning the word, "Faith". The Shipmaster was subsequently deemed worthy of being bound to the Prophet, and the world was completely glassed by the rest of the fleet. Later, six years after the Human-Covenant War, the Shipmaster returned to the world, trying to find purpose in his life and some atonement for his sins in glassing the world. There, among the bones of his victims, he found Kig-yar and humans fighting over relics that were obviously Forerunner. Upon finding a wounded human survivor, the Shipmaster gave command to bring down a more permanent force, to learn more of the relics. What happened after the event remains unknown.

Due to the fact that after the war the planet was still habitable, it is possible that the planet was only partially glassed by the Covenant.