Unyielding Heirophant

The Unyeilding Heirophant is seen in the last part of Halo: First Strike. It is speculated that this is a second Covenant home world. It is destroyed when the Ascendant Justice, under the command of Admiral Whitcomb, crashes into it, destroying not only the Unyeilding Heirophant, but also around 500 other Covenant ships.