Ephsu system

Ephsu is a star system in the Sagittarius Arm of the Milky Way. It is notable as the former system of Installation 07 before it moved to a unspecified region of space in late 2559.

System summary
The system is in the Sagittarius Arm of the Milky Way. It contains a M-dwarf star, with one terrestrial planet, which served as the anchor for Installation 07.

System locations

 * Ephsu I: A terrestrial planet.
 * Installation 07 : The seventh Halo ring, Zeta Halo. Currently moved to an unknown location in space.

Positioning of Installation 07
Following orders by the IsoDidact, Installation 07 was sent to an unknown system, where, according to Chakas, the ring "became a sacred tomb for millions, though some may still live." Later on, Installation 07 received its final activation preparations, and finally fired after the other six Halo rings in 97,445 BCE. However, following the array's firing and the process of reintroducing life to the galaxy had begun, an uncatalogued species known as the Xalanyn were discovered to have survived the pulse. At the behest of the remaining Forerunner council, the installation 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.

Discovery by humanity
The system was discovered as Installation 07's location by renowned human scientist and historian Doctor Luther Mann after a year of sifting through data he'd discovered during his stay at the ONI Research Facility Trevelyan.

There was a research outpost on the Halo established by March 2555, and by August 2558 was protected by at least two s.

Created conflict
During the Created conflict in 2559, the system was the site of a major battle. The Banished, led by War Chief Escharum, invaded the Halo. A battle both in space and on the installation took place, with the UNSC suffering major losses, leaving the installation occupied by the Banished, and badly damaged by a cataclysmic explosion. Following the explosion, Zeta Halo was suddenly relocated from the Esphu system to an unknown location by Cortana.

List of appearances

 * Halo: Hunters in the Dark
 * Halo 5: Guardians
 * Halo: Point of Light
 * Halo Infinite
 * Halo: The Rubicon Protocol