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Oth Sonin system[1]


Oth Sonin[1]

Orbital position:

Third planet[1]


Three; Warial, Soirapt, Teash[1]



24,930 kilometers (15,490 mi)[2]


2.1 G[1]


1.3 (N2, O2, Ar)[1]

Surface temperature:

-15°C to 52°C (5°F to 125.6°F)[1]






UNSC strategic significance:

Medium (2558)[3]

UNSC threat level:

Delta (2558)[3]


"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[4]

Doisac, designated CE-75-2113 c by the Forerunners,[5] was the third planet of the Oth Sonin system and the homeworld of the Jiralhanae. The planet possessed three natural satellites, Warial, Soirapt, and Teash.[1]




Doisac was a tropical world, where volcanic activity was common. At least half of Doisac's surface was covered in rain forests, while the other half was largely composed of molten rock, lava, and large volcanoes. Doisac had a very harsh environment, yet it was still preferred by many Jiralhanae.[6] The rocky, forested planet also contained large amounts of deserts, and a few seas of water.[7]

Normal asset of Doisac changed into Height
A map of the planet.

Its environment was very Earth-like, with forests and oceans, although its gravity was twice that of Earth. It has been noted, however, that its terrain was dominated by magma and magnetism, hinting at high tectonic activity and rich magnetized iron deposits. It is possible that Doisac was closer to Oth Sonin than Earth is to Sol because its surface temperature/climate was slightly more tropical, ranging from -15 °C to 52 °C (5 °F to 125.6 °F). Alternatively, its atmosphere may have caused 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 was orbited by three natural satellites; Soirapt, Warial, and Teash. The latter two[8] were industrialised and populous.[2]



Ancient history[edit]

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.[9] 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.[10]

Post-Great Purification[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.[9][11] The First Immolation failed to stop conflict, however, as the Battle of Gbraakon took place on Doisac at some point after that.[12] 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.[13]

Covenant era[edit]

After their induction to the Covenant, many Jiralhanae left Doisac to settle on Covenant colonies or live on High Charity.[6] Following Atriox's rebellion and the formation of a military alliance known as the Banished, as the Warmaster gained support across the Orion Arm, the Banished War Chief Escharum turned his attention to Doisac, hoping to reignite and accelerate the Jiralhanae's progress in all political and military arenas.[14]

During the months of the Great Schism, Doisac was presumed to be a spot for battles between the Covenant and the Sangheili.[15]


Although most Jiralhanae returned to Doisac after the war,[9] 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.[16] 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.[17] However, Escharum's formative strategy to plating a Banished presence on Doisac before the conclusion of the War of Annihilation proved advantageous for the military alliance, as the collapse of the Covenant and the volatile political landscape on Sanghelios allowed the Banished to be uniquely positioned to take advantage of the fallout, setting into motion their swift rise to power.[14]

The Jiralhanae on Doisac lacked a strong leader to stabilize them since the Covenant's fall,[18] with the various infighting master-packs putting them at a disadvantage in their ongoing conflicts against the Sangheili.[19] The Children of Oth Sonin, one of the more powerful master-packs in the wake of the war and led by Chieftain Lydus, provided security and provisions to the outlying citadels across across its star system.[20] The Voice of Maardoth was once a weak tribe by comparison and relegated to Doisac's outlands, but would becoming a powerful and imposing military force as its leader Hekabe usurped the tribe and killed his predecessor Remarus, leading the Voice of Maardoth to grow in power.[20] Prior to 2558, a powerful military alliance known as the Banished, established before the war by its Warmaster Atriox, had begun attacks on Doisac, impressing independent clans of the Banished's strength while eliminating rival warlords who refuse to bow to Atriox.[21]

Due to their failure to install order on Doisac,[22] and imminent famine on in March 2558 as their supplies ran short, Lydus and his Children of Oth Sonin were willing to attempt peace negotiations with the Swords of Sanghelios mediated by the UNSC on Ealen IV, until they were interrupted by a mercenary attack. The peace negotiations were left at a standstill.[16] Secretly, the Children of Oth Sonin had also struck a deal with the Banished, using the Banished to to take out Lydus' most dangerous rivals in exchange for full access to the shipyards and land under the control of the Children of Oth Sonin.[22]

By October 2558, a mass power consolidation and cooperation had begun to take form on the planet and its moons under the Banished, leading the UNSC to consider targeted strikes to prevent this unification,[3] as Chieftains under Atriox's command spread the power and influence of the Banished across Jiralhanae colonies.[23] Atriox himself had become a symbol for the Jiralhanae on the planet to rally behind with many joining the Banished.[24] Despite this, there were Jiralhanae who rejected joining the Banished due to their hatred of the Sangheili,[25] while others, such as the clans on the moon of Warial, have become increasingly wary of any alliance resembling the Covenant.[14]

Created uprising[edit]

goodnight sweet prins (rip).
Doisac destroyed by Guardians.

"Look upon Doisac one last time and remember: You chose this path."
— Cortana as she prepares to destroy Doisac.[26]

Following the The Reclamation in 2558, many Jiralhanae were unwilling to give in to the new Created threat. Instead, the Banished united the various clans across the planet and its moons and fought back against the Created.[14] Cortana called on the Banished leader Atriox to submit.[27] When Atriox refused her, she responded by sending a septet of Guardians to fire beams at the planet, resulting in its total destruction.[26] With the planet's physical destruction, its shards slammed into and damaged its moons.[14]

Following the destruction, the planet's cooling husk was described to be rich in materials capable of fueling generations of reprisal.[28] Some members of the Children of Oth Sonin continued to lurk in the shadows of the system.[22]

Production notes[edit]

The destruction of Doisac, as depicted in Halo Infinite was at one point in development intended to be accomplished via the firing of a Halo ring over the planet.[29] At some point in development for unknown reasons, this was changed to Guardians.


  • 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.[30]


List of appearances[edit]


  1. ^ a b c d e f g h i j k l m Halo 3, Bestiarum
  2. ^ a b Halo Encyclopedia (2022 edition), page 211
  3. ^ a b c Halo: Official Spartan Field Manual, page 90
  4. ^ Halo 5: Guardians, campaign level Alliance
  5. ^ Waypoint: Catalog Interaction page 14
  6. ^ a b Halo Encyclopedia (2009 edition), page 309
  7. ^ Halo Encyclopedia: The Definitive Guide to the Halo Universe, p. 143
  8. ^ Halo: Evolutions: Stomping on the Heels of a Fuss
  9. ^ a b c Halo Waypoint: Jiralhanae
  10. ^ Halo Legends: Origins
  11. ^ Halo: Envoy
  12. ^ Halo: The Essential Visual Guide, page 122
  13. ^ Halo: Contact Harvest, page 194
  14. ^ a b c d e Halo Encyclopedia (2022 edition), page 446-447
  15. ^ Halo Encyclopedia (2011 edition)
  16. ^ a b Halo: Escalation: Issue 1
  17. ^ 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."
  18. ^ Halo Wars 2, Phoenix Log: Rise of Atriox IV
  19. ^ The Return (Motion comic)
  20. ^ a b Halo Encyclopedia (2022 edition), page 247
  21. ^ Halo: Official Spartan Field Manual, page 160: "Brute Captains within the Banished lead the terror and raiding packs that extort resources and smash the defenses of the settlements they raid. They also lead attacks on Doisac itself, impressing independent clans with their strength and killing rival warlords who refuse to bow to Atriox."
  22. ^ a b c Halo Encyclopedia (2022 edition), page 255
  23. ^ Halo: Official Spartan Field Manual, page 156
  24. ^ Halo Wars 2, Phoenix Log: Rise of Atriox VI
  25. ^ Halo: Rise of Atriox: Issue 5 "Jiralhanae do not band with Sangheili and give themselves names."
  26. ^ a b Halo Infinite, campaign level Repository
  27. ^ Halo: Outcasts, chapter 11: "Cortana has already used her Guardians to punish a Jiralhanae warlord by annihilating the homeworld of his entire species, and she will do the same to anyone who defies her."
  28. ^ Halo Infinite, Armor Hall: Blood of Doisac - Visor Description "The cooling husk of Doisac is rich in materials that will fuel generations of reprisal."
  29. ^ ArtStation, Halo Infinite: Glassing of Doisac: "Early story explorations for Halo Infinite" (Retrieved on Jan 17, 2021) [archive]
  30. ^ Halo: Broken Circle, chapter 14