Ephsu I

"Not much around except that super hunk of rock out there blocking our target."

- Lessa

Ephsu I is the sole planetary body in the Ephsu system. It is a massive, uninhabited terrestrial world that has an atmosphere and water present. The planet was most noteworthy for being the former anchor for Installation 07.

Anchor for Installation 07
Following the orders for the IsoDidact, Installation 07 was sent to an unspecified system, where, according to Chakas, the ring "became a sacred tomb for millions, though some may still live." Installation 07 eventually received its final activation preparations, and fired after the other six Halo rings in 97,445 BCE. However, following the array's firing and the process of reseeding the galaxy with intelligent life had begun, an uncatalogued species called the Xalanyn were discovered to have mysteriously survived. At the behest of the remaining Forerunner council, Installation 07 was moved to the Ephsu system so that it would be in close proximity to the Xalanyn's homeworld. After a parley between the two species, the Xalanyn were imprisoned on Installation 07, which remained in orbit over Ephsu I.

As of late August 2558, Installation 07 stood at a distance of fewer than 12,000 kilometers from the planet.

Battle for Zeta Halo
In December 2559, during the Battle for Zeta Halo, Zeta Halo was rocked by a cataclysmic explosion. Shortly thereafter, it was suddenly moved from in orbit around Ephsu I to an unknown location in space by Cortana.

List of appearances

 * Halo 5: Guardians
 * Halo: Point of Light
 * Halo Infinite