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