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Oth Sonin system[1]


Oth Sonin[1]

Orbital position:

Third planet[1]


Three; Warial, Soirapt, Teash[1]



2.1 G[1]


1.3 (N2, O2, Ar)[1]

Surface temperature:

-15°C to 52°C (5°F to 125.6°F)[1]





12.5 billion (During the Covenant War)[1]


"Doisac. Doisac. Doooiisac. Doi-sac. Planet of the Brutes everybody! Coulda' named it anything, they could have! But they named it Doisac. Doisac!"
Dimkee Hotay[3]

Doisac, designated CE-75-2113 c by the Forerunners,[4] is the third planet of the Oth Sonin system and the homeworld of the Jiralhanae. The planet possesses three natural satellites, Warial, Soirapt, and Teash.[1]


Doisac's surface inhabited by ancient Brutes.


Because of its harsh environmental conditions, numerous predators evolved on Doisac throughout its history, among them the initially arboreal Jiralhanae.[2] Doisac was visited by the Forerunners during the Lifeworkers' Conservation Measure. The Jiralhanae were one of many sentient species indexed by the Librarian for preservation aboard Installation 00. After the Halo Array was fired, the Jiralhanae were returned to Doisac to begin rebuilding their culture.[5]

First Immolation[edit]

Doisac was a very war-torn land due to constant Jiralhanae civil warfare, typically between clans. Despite their savagery, Jiralhanae proved intelligent enough to achieve spaceflight and space-faring status. However, their warlike nature inevitably led them into conflict, and eventually the various Jiralhanae master-packs fell into a massive war known as the First Immolation. The planet became heavily damaged from the use of nuclear weapons and almost led to the extinction of the Jiralhanae.[2][6] The First Immolation didn't stop conflict though as the Battle of Gbraakon took place on Doisac at some point after that.[7] With Jiralhanae society collapsed, by the time the Covenant discovered them in 2492, the species had just rediscovered radio and rocketry. In their primitive state, they were quickly defeated and absorbed into the Covenant.[8]

Time of the Covenant[edit]

After their induction to the Covenant, many Jiralhanae left Doisac to settle on Covenant colonies or live on High Charity.[9] During the months of the Great Schism, Doisac was presumed to be a spot for battles between the Covenant and the Sangheili.[10]


Although most Jiralhanae returned to Doisac after the war,[2] many also continued to inhabit the worlds the Covenant had previously given them; however, due to their lack of advanced technology and their disorganized society, they were unable to obtain resources or even food for themselves resulting in famine, and instead resorted to raids on Sangheili colonies.[11] The Vheiloth Jiralhanae saw the raids as a necessity, while the Rh'tol Jiralhanae glorified their piracy as power over the Sangheili for oppressing them.[12]

The Jiralhanae on Doisac lacked a strong leader to stabilize them since the Covenant's fall,[13] with the various infighting master packs putting them at a disadvantage in their ongoing conflicts against the Sangheili.[14] One of the governing master packs, Lydus' clan, was willing to attempt peace negotiations with the Swords of Sanghelios on Ealen IV until they were interrupted by a mercenary attack.

By 2558, Atriox had become a symbol for some Jiralhanae on Doisac to rally behind with some joining his Banished.[15] Despite this, many Jiralhanae rejected joining due to their hatred of the Sangheili in the mercenary organization.[16] Working alongside Sangheili was frowned upon on the Jiralhanae homeworld.[17]



Doisac is a tropical world, where volcanic activity is common. At least half of Doisac's surface is covered in rain forests, while the other half is largely composed of molten rock, lava, and large volcanoes. Doisac has a very harsh environment, yet it is still preferred by many Jiralhanae.[9] The rocky, forested planet also contains large amounts of deserts, and a few seas of water.[18]

Its environment is very Earth-like, with forests and oceans, although its gravity is twice that of Earth. It has been noted, however, that its terrain is dominated by magma and magnetism, hinting at high tectonic activity and rich magnetized iron deposits. It is possible that Doisac is closer to Oth Sonin than Earth is to Sol because its surface temperature/climate is slightly more tropical, ranging from -15°C to 52°C (5°F to 125.6°F). Alternatively, its atmosphere may cause a greenhouse effect, either due to the actions of the Jiralhanae or naturally, trapping heat and warming up the planet in a similar fashion to Venus.[1]

The planet is orbited by three natural satellites; Soirapt, Warial, and Teash. The latter two have some form of Jiralhanae settlements on them.[19]



  • The environments and structures of Doisac that are depicted in Origins appear almost identical to the planet Kashyyyk from the Star Wars franchise.
  • The Palace of the Hierarchs on High Charity had drapery that contained the continental tracery of Doisac within a circle, to make visiting Jiralhanae, such as Tartarus, feel important.[20]


List of appearances[edit]


  1. ^ a b c d e f g h i j k l m Halo 3, Bestiarum
  2. ^ a b c d Halo Waypoint: Jiralhanae
  3. ^ Halo 5: Guardians, campaign level Alliance
  4. ^ Waypoint: Catalog Interaction page 14
  5. ^ Halo Legends, Origins
  6. ^ Halo: Envoy
  7. ^ Halo: The Essential Visual Guide, p. 122
  8. ^ Halo: Contact Harvest, p. 194
  9. ^ a b Halo Encyclopedia (2009 edition), p. 309
  10. ^ Halo Encyclopedia: The Definitive Guide to the Halo Universe
  11. ^ Halo: Escalation, Issue #1
  12. ^ Halo: Envoy, chapter 3 "The Rh’tol skein now gloried in the piracy against the former Covenant. It let them show their true strength to the very face of the Sangheili species that had so poorly treated them. The Vheiloth skein saw such looting and destruction as an unfortunate necessity."
  13. ^ Halo Wars 2, Phoenix Log: Rise of Atriox IV
  14. ^ Halo: Evolutions The Return
  15. ^ Halo Wars 2, Phoenix Log: Rise of Atriox VI
  16. ^ Halo: Rise of Atriox Issue 5 "Jiralhanae do not band with Sangheili and give themselves names."
  17. ^ Halo: Envoy, chapter 3: "The Sangheili had lorded over the Jiralhanae in the Covenant for decades. They openly despised the Jiralhanae and had torn apart the Covenant in open war the very moment the Jiralhanae became favored by the Prophets. The Great Schism, as most Jiralhanae knew, had shown the truth of the Elite–Brute relationship—the Sangheili were arrogant and cruel slavers. For Hekabe to offer assistance to an Elite showed incredible vulnerability and poor character, as far as his opposition was concerned."
  18. ^ Halo Encyclopedia: The Definitive Guide to the Halo Universe, p. 143
  19. ^ Halo: Evolutions, Stomping on the Heels of a Fuss
  20. ^ Halo: Broken Circle, Chapter 14