Ephsu system

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Ephsu system
Stellar overview

Orbiting planets:


Societal overview



Ephsu is a star system in the Sagittarius Arm of the Milky Way.[1] It is notable as the former system of Installation 07 before it moved to a unspecified region of space in late 2559.[2][3]


System summary[edit]

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.[2]

System locations[edit]


Positioning of Installation 07[edit]

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."[4] Later on, Installation 07 received its final activation preparations,[5] and finally fired after the other six Halo rings in 97,445 BCE.[6][7] 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.[8] 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.[9][10] After a parley between the two species, the Xalanyn were imprisoned on Installation 07,[11] which remained in orbit over Ephsu I.[10][2]

Discovery by humanity[edit]

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.[12]

There was a research outpost on the Halo established by March 2555,[12] and by August 2558 was protected by at least two Halberd-class light destroyers.[2]

Created conflict[edit]

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[3] by Cortana.[13]

List of appearances[edit]


  1. ^ Halo: Warfleet - The Galaxy, page 12
  2. ^ a b c d e f Halo: Point of Light, chapter 8
  3. ^ a b c Halo Infinite
  4. ^ Halo: Primordium, chapter 42
  5. ^ Halo: Silentium, String 36
  6. ^ Halo: Silentium, String 38
  7. ^ Halo Encyclopedia (2022 edition), page 350
  8. ^ Halo Infinite, Banished Audio log: Archaeological Findings #03 - Xalanyn
  9. ^ Halo Infinite, Audio log (Halo Infinite)#Archaeological Findings 2: Archaeological Findings #04 - A Curious Directive
  10. ^ a b Halo Waypoint, Canon Fodder - Ship Strike (Retrieved on Apr 22, 2023) [archive]
  11. ^ Halo Infinite, campaign mission Endless: Silent Auditorium
  12. ^ a b Halo: Hunters in the Dark, chapter 1
  13. ^ Halo: The Rubicon Protocol, page 268