From Halopedia, the Halo wiki
Qikost is one of the two massive natural satellites of Sanghelios, along with Suban. Qikost is silver in color. The large size of both Qikost and Suban had great effects of the tides on Sanghelios.
Topography and ecology
Qikost is home to large Sangheili population centers, major industrial sites, and many significant armories. The vast wilderness of Qikost is home to several Sangheili hunting preserves. Sangheili frontiersmen once used early prototypes of the Type-48 Revenant to traverse these preserves.
Early in the Covenant's history, Qikost produced Sangheili swords of the highest quality, including burnblades. Partly functioning Forerunner ancillas were also brought to several armories on Qikost for studying purposes.
List of appearances