The First Immolation, sometimes described as the great civil war, was a vicious, decade-long Jiralhanae civil war that took place on the species' homeworld of Doisac. The conflict was the culmination of a number of prior wars and ultimately led to the devastation of civilization on the planet.
Prior to the First Immolation, the Jiralhanae had recently become a technological Tier 4 species, achieving rocket-based spaceflight and establishing colonies in the Oth Sonin system. While the Jiralhanae are divided into numerous pack-like clans, almost all of the clans were divided into two prominent skeins: the arguably primitive Rh'tol and the more sophisticated Vheiloth. These skeins were profoundly different in both culture and philosophy, with both sides having different means to pursue power. Despite the technological progress the Jiralhanae achieved, their pack mentality and ritualistic, warrior culture led to inevitable conflict between both skeins.
The war was eventually started by the powerful Chieftain Rukt of the Rh'tol skein, when members of both the Rh'tol and the Vheiloth collided after a protracted territorial dispute took a sudden and violent turn. The resulting global war led to a widespread mechanized war of attrition across Doisac, in which the various master-packs came into conflict with each other. Chieftain Rukt and members of his clan were responsible for killing thousands of Jiralhanae across Doisac's surface during this war, while earning a name for the clan's war hammer Fist of Rukt.
The First Immolation ultimately lasted a decade as the Jiralhanae set their homeworld ablaze in conflict and nearly caused their species' own extinction. The use of nuclear weapons heavily damaged the planet's ecosystem and killed numerous Jiralhanae. Parabum's and Ceretus' clans battled each other before and during the conflict. During the war, armored hovercraft ranged across Doisac's plains, of which the future Marauders would be reminiscent of. Though most battles in the war were brief, the effects of the First Immolation proved devastating to Jiralhanae society.
The First Immolation was a nuclear holocaust of such magnitude that the war caused the Jiralhanae to regress to a Tier 7 pre-industrial society, setting the species technologically back several hundred years in science and machinery. Some thought the war had crippled their people, but others believed that it had only served to temper the Jiralhanae and make them stronger. The Jiralhanae were forced to rediscover the advances their ancestors had made before them. While some clans were ashamed of the technological progress the Jiralhanae had lost after the war, other clans were not bothered by the loss as they believed that the species was becoming too dependent on technology. The Jiralhanae are noted to be the only known species that achieved spaceflight, reverted themselves to a pre-industrial society through civil war, and recovered to some degree without historically learning anything from the experience.
The Battle of Gbraakon occurred shortly after the First Immolation, taking place in the Gbraakon territory. When the Covenant discovered Doisac in 2492, the First Immolation had just recently concluded. At this time, the Jiralhanae were just rediscovering radio and rocketry, as well as the applications these technologies could have in warfare. Ill-prepared for the Covenant's arrival, survivors from the Rh'tol and the Vheiloth skeins would be incorporated into in the Covenant. Some clans were grateful for the technology the Covenant would provide, replacing what the Jiralhanae lost in the war. When the Covenant collapsed in 2552, many Jiralhanae returned to Doisac. However, the damage done to the planet in the First Immolation resulted in a lack of supplies for its inhabitants, forcing Jiralhanae to raid the frontier colonies of the Sangheili.
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