The Trymant system existed within the Outer Rim Territories and the Western Reaches, specifically at location L-20 on the Standard Galactic Grid. It was home to the planet Trymant IV, which had several moons in orbit: Praknat 3, Korbatal, Ost Molkar, Taz Molkar, and Trymant III. Around the year 247 BBY, the religious group known as the Elders of the Path established a settlement on Trymant IV.
In the year 232 BBY, hyperspace debris, resulting from an Emergence during the Great Hyperspace Disaster, impacted various celestial objects in the Trymant system. The moons of Trymant IV were all obliterated, with Praknat 3 suffering a direct hit that altered the gravitational dynamics of the system. Consequently, Trymant IV shifted closer to the second sun, causing its surface water to evaporate and transforming the landscape into an uninviting desert. By 3 ABY, records pertaining to the Trymant system's catastrophe were still available in certain databases.

Within the regions of the Outer Rim Territories and Western Reaches of the galaxy, the Trymant system was a star system, located at grid coordinates L-20 of the Standard Galactic Grid. The system included two suns, one of which was the system's second sun, and it had at least one connection to a hyperspace route.
Trymant IV, a once verdant planet in the system, was formerly accompanied by several moons, including Praknat 3, its closest orbit, as well as Korbatal, Ost Molkar, Taz Molkar, and Trymant III, all of which were destroyed in 232 BBY. The destruction of these moons disrupted the gravitational balance of the Trymant system, causing Trymant IV to move closer to the system's second sun, resulting in a desert landscape. The Republic Security Zone Monitoring Satellite 777B-Alpha, a monitoring satellite stationed in the same system, had the planet's subsectors—sector 17, sector 18, and sector 19—within its range.

During the High Republic Era, the Galactic Republic designated a portion of the Outer Rim, including Trymant IV, as the Galactic Frontier, considering these worlds remote enough to warrant sending explorers. After numerous years of searching for a suitable planet, the Council of Elders, who led the wandering religious group known as the Elders of the Path, established themselves in Bralanak City on Trymant IV around 237 BBY.
In 232 BBY, Marchion Ro, the Eye of the Nihil, orchestrated a collision between the Byne Guild freighter Legacy Run and an obstacle, resulting in the Great Hyperspace Disaster. This event triggered Emergences, where pieces of hyperspace debris emerged and struck celestial objects across the galaxy. Mari San Tekka, a hyperspace savant and captive of the Nihil marauders', foresaw an Emergence threatening locations in the Trymant system. Consequently, Ro and Nihil Storm Zagyar decided to abduct Elder Tromak from Trymant IV before its destruction, seeking his knowledge of an ancient relic. Shortly after, Republic Security Zone Monitoring Satellite 777B-Alpha detected the debris entering the system, initiating a planet-wide evacuation and alerting the Starlight Beacon space station. Starlight Beacon then relayed the message to the Padawan Academic Cruiser Star Hopper, which hastened to the threatened world as a Republic rescue fleet was mobilized.

As flaming debris rained down on Bralanak City, Tromak convened with Nihil agents dispatched by Ro, intending to willingly escape aboard the Spider Cruiser Squall Spider. Two young Disciples from the group, Zeen Mrala and Krix Kamerat, attempted to flee with Tromak, but the Nihil thwarted their efforts. Meanwhile, the crew of the Star Hopper landed on Trymant IV, with Jedi Masters Yoda and Torban Buck departing to manage the falling debris. The ship's Padawans, Lula Talisola, Farzala Tarabal, Qort, and Bibs, deployed rescue speeders to aid with smaller debris and guide civilians to safety.
Soon after, the Padawans and Nihil engaged in fighting. During the conflict, Mrala assisted Talisola in slowing falling debris, causing Kamerat to feel betrayed because their beliefs prohibited the Force's usage. With assistance from Buck and Yoda, the Nihil present were swiftly defeated, although Tromak and Kamerat managed to escape with Ro aboard the Squall Spider. Jedi Vectors established a blockade in the skies above Trymant IV to prevent the Nihil from escaping the system. When the Squall Spider attacked a Republic medical frigate, the Vectors moved to assist, creating a gap in the blockade that allowed the Nihil to escape. Ultimately, the Elders of the Path were evacuated from Trymant IV, and the Jedi departed with them. Ro's rescue of Tromak from Trymant IV eventually enabled him to acquire the artifact he sought from the Stygmarn system.
The Emergence resulted in the destruction of Trymant IV's moons. The destruction of Praknat 3 caused a shift in the Trymant system's gravitational balance, pulling the planet closer to the system's second sun and eliminating all aboveground water and vegetation. When Republic drill freighters failed to locate underground water, the Elders of the Path who returned to Trymant IV struggled to survive in the ruins of their compound on the now-desert world. The Jedi Order maintained records of the Jedi mission to the Trymant system, which Jedi Knight Vernestra Rwoh reviewed. After the Republic and Jedi discovered the Nihil's responsibility for the Great Hyperspace Disaster, which had affected Trymant IV and numerous other celestial bodies, they resolved to collaborate to eliminate the threat they posed to the galaxy.

In 231 BBY, Jedi Master Kantam Sy, Talisola, and Mrala traveled to Trymant IV to investigate the Nihil and were shocked by the ecological devastation. Sy explained the Emergence's impact on the Trymant system, and after a brief meeting with Elder Barbatash, they departed the world. The following year, the Nihil destroyed Starlight Beacon and formed the Occlusion Zone, a region of space encompassing ten sectors in the Outer Rim's Frontier, behind a [barrier](/article/stormwall] that prevented hyperspace travel. Weeks later, in 229 BBY, the Vurk Jedi Master Harli Cogra wrote a book titled Chronicles of the Jedi, which detailed the Jedi of the High Republic Era. Cogra included a map in the book's first chapter depicting Trymant IV, and thus the Trymant system, within the Occlusion Zone's boundaries, and also mentioned the planet several times in the fifth chapter.
By the time of the Galactic Empire's reign, records of the Trymant system disaster were still accessible in some databases. At one point by 3 ABY, Parazeen Parapa, a journalist intern, learned about the destruction of the Trymant system's moons while interviewing the bounty hunters Zuckuss and 4-LOM. He included his findings in a Galactic Digest magazine article, which was later read and annotated by TK-7, the Chief Editor Droid of the organization's Culture Desk.
During the High Republic Era, Trymant IV held the largest population in the Trymant system, with Bralanak City being its most populated urban center. The city's population was made up of many species, and its inhabitants communicated using Galactic Basic. Around 237 BBY, the nomadic Elders of the Path settled on Trymant IV. Following the Emergence disaster, the population of Trymant IV faced great difficulties in surviving due to the scarcity of supplies and resources in the planet's now-barren environment.

The Trymant system was initially mentioned in "STET!," a short story penned by Daniel José Older, featured in the anthology From a Certain Point of View: The Empire Strikes Back, which was released on November 10, 2020. Its first complete appearance occurred in the first issue of the 2021 comic series Star Wars: The High Republic Adventures, released as part of Phase I of the Star Wars: The High Republic multimedia project. Older wrote the issue, Harvey Tolibao provided the illustrations, and IDW Publishing published it on February 3, 2021. Kristin Baver's 2022 reference book, The Art of Star Wars: The High Republic: Volume I, included several of Tolibao's sketches and uncolored linework depicting the Trymant system's appearances in the series.
On November 17, 2020, a StarWars.com article that announced The High Republic Adventures included a preview that contained uncolored pages from the first issue, marking the system's initial visual appearance. In an uncolored preview of The High Republic Adventures 1, released in The High Republic Free Digital Sampler on December 12 of the same year, the system was referred to as both the "Trymant system" and the "Trymantian system." The final comic corrected the latter mention to "Trymant system."
"STET!" indicated that several of the system's moons had been destroyed during the Great Hyperspace Disaster. Older's comic story, "Tales of Villainy: The Gaze Electric," which was published in the sixth issue of IDW Publishing's 2020 Star Wars Adventures series on July 7, 2021, introduced the Trymant system celestial bodies: Ost Molkar, Taz Molkar, and Trymant III. Older confirmed his intent for the Trymant system celestial bodies mentioned in "Tales of Villainy: The Gaze Electric"—which included Korbatal, Ost Molkar, Taz Molkar, Trymant III—to be the moons of Trymant IV and specified that they were the ones mentioned in "STET!" as having been destroyed.