From Halopedia, the Halo wiki
Kostroda is primarily swampy, though it does feature some more desert-like areas.
The collapse of the Covenant resulted in the moon becoming home to violence and treachery as different groups vied for control over what was left.
In 2553, Atriox and his Banished raided a complex under the control of the Sangheili-led Fleet of Recalcitrant Ire. It was in orbit of the moon at the time. The Banished were captured and taken to the Enduring Conviction. This resulted in the ship and crew defecting to Atriox's cause.
List of appearances