Joyous Exultation
From Halopedia, the Halo wiki
Joyous Exultation is, to date, the only known Covenant colony. It was located in the fringe of the massive Covenant empire in the Salia System. It had a small moon, Malhiem.
During the Civil War of the Covenant, the world was a rallying point for the Elites, under the leadership of Xytan 'Jar Wattinree. The Combined Fleet of Righteous Purpose met here, along with ships from the Second Fleet of Homogenous Clarity aswell as many other Elite controlled ships as could be found. They planned to set up a meeting with the Covenant Separatists on this planet, where they would massacre the Brute and Prophet leadership.
Unfortunately, the plan was averted in 2552 when a NOVA taken from Reach by the supercarrier Sublime Transcendence exploded, vaporising a quarter of the world, destroying the planet's moon, and causing massive shock waves that leveled many cities on other parts of the planet. In addition, the explosion resulted in 300mph winds that destroyed most remaining cities, and spawning massive tidal waves that destroyed much of the coastline.
The current state of the planet is unknown.
