Unidentified Forerunner planet

This unidentified planet is a world that was part of the Forerunner ecumene prior to the Flood invasion, culminating in the Forerunner-Flood war. The surface of the planet was covered in massive Forerunner structures and glyphs.

Trivia
The Forerunner symbol for the number "0" appears throughout the planet's surface. This is also the symbol for the Iris campaign.

List of appearances

 * Halo Legends
 * Origins