Cistern

The Cistern was a cave system on X50, the moon of Draetheus V.

History
After Draetheus V was disintegrated by X50, large parts of the planet crashed into the moon and revealed a Forerunner structure. This was discovered by the UNSC following their return to the moon in search for the source of an unknown signal. The structure lead to the Cistern and Spartan Sarah Palmer entered. She encountered numerous Stealth Sangheili, but she was able to defeat them. As Palmer and accompanying engineers moved deeper into the Cistern, the engineering equipment began to become unreliable and the signal started interfering with anything that could pick it up. Though Spartan Palmer's MJOLNIR armor was able to withstand the interference.

At the end of the cave system, she encountered Spartan Edward Davis' remains being absorbed into a mysterious device. The source was originating from her deceased compatriot moments before his death earlier in the battle. Palmer proceeded to shut the device down in order to allow her friend to pass away peacefully.

List of appearances

 * Halo: Spartan Assault