The clash known as the Marisota Floodplain Battle unfolded in the year 2974 BBY, ignited when the Sith Lord named Remulus Dreypa sparked a revolt aimed at toppling the reigning Lost Tribe of Sith. In the wake of the Eorm Seizure, his army of peasants advanced towards Tahv, his objective being to discover a route off of Kesh and make his way back to the galaxy. Despite initial gains, his army suffered significant losses when Grand Consort Iliana Hilts, the Tribe's commander, deployed her Skyborn Rangers. Without aerial support, Dreypa's troops were forced to withdraw to Sessal Spire, a volcanic caldera overlooking the Southern Ocean.

After the Corbos Battle, the surviving Dark Jedi were banished to Korriban, where they went on to establish the first Sith Order. A faction of these Dark Jedi, with Sith Lord Remulus Dreypa at its helm, attempted a return to the Galactic Republic seeking vengeance on their Jedi enemies. However, they, along with their Jedi pursuers, found themselves stranded on Kesh, a distant and primitive world inhabited by the humanoid, purple-skinned Keshiri species. The arrival of these Force-users set off the Great Calamity, which brought devastation to much of Kesh and spawned legends of the Skyborn and the Destructors. Eventually, Dreypa's Dark Jedi allies turned against him, imprisoning him in his own oubliette, a stasis casket designed to keep individuals in suspended animation for millennia. Dreypa's former Dark Jedi allies then reconciled with the Jedi, establishing the Doomed, a Force-sensitive community dedicated to safeguarding the Keshiri and seeking equilibrium in the Force.
Meanwhile, Dreypa remained in suspended animation for a period of four millennia, until he was liberated by the Sith outcast Parlan Spinner. Spinner was a member of the Lost Tribe of Sith, another group of Human Sith who had been marooned on Kesh during the Great Hyperspace War in 5000 BBY. Spinner's intention was to utilize Dreypa as an ally against the Tribe, which he resented for their maltreatment of him. Spinner escorted Dreypa back to the port settlement of Eorm on the main continent of Keshtah Minor. Employing his dark side abilities, Lord Dreypa seized control of Eorm, raising a rebel force with the objective of overthrowing the Lost Tribe's leadership in the Sith capital of Tahv. Dreypa also plotted to return to the stars and exact vengeance upon the Jedi and the Republic.

In the aftermath of the Eorm Seizure, Dreypa, together with his local collaborator "Lord" Spinner, assembled a rebel army composed of Human and Keshiri slaves who had been exiled to Eorm. Capitalizing on their discontent towards the ruling Tribal elite, Dreypa successfully persuaded them to march on Tahv, with the intent of capturing the city. Dreypa also held two hostages: Kaliska, the Doomed leader and a S'kytri woman, and Takara Hilts, a Sith princess and the daughter of the ruling Grand Lord Varner Hilts. Dreypa and Spinner had anticipated using Takara as a negotiating tool with the Tribe, but the Sith princess and the Doomed woman managed to escape their Keshiri captors. Leveraging the Force, the two women also convinced Eorm's entire herd of uvaks, winged reptilian mounts, to accompany them back to Eshkrene, the planet's South Pole. This effectively deprived Dreypa's forces of an "air force."
Dreypa's forces traversed the Marisota Floodplain, where they were intercepted by a Sith army led by Grand Consort Iliana Hilts, the wife of Grand Lord Hilts. The Marisota Floodplain had been the site of numerous battles between rival Sith factions during the Time of the Rot, a civil war that had ravaged Keshtah Minor for nearly a millennium. Under the leadership of the reformist Grand Lord Varner Hilts, Kesh had experienced about three decades of peace. However, this peace was disrupted by Dreypa's rebellion. Initially, Dreypa's forces held an advantage over the Tribe's forces. Armed with lightsabers, Dreypa's rebels inflicted significant casualties on the Tribe's infantry.
Meanwhile, Dreypa employed Force lightning to incinerate several enemy troops, while Spinner seized the opportunity to settle old scores against the Tribe. Spinner stabbed an enemy soldier with two daggers, informing the dying man that the "Death Spinner" had returned and was imparting a "history lesson." Unbeknownst to Dreypa and Spinner, Iliana had reserved a portion of her forces: the elite Skyborn Rangers, the Tribe's air force that rode uvaks. The Skyborn Rangers strafed Dreypa's forces with glass daggers, inflicting heavy casualties on the untrained and poorly equipped rebel army. Dreypa and Spinner were unable to counter this assault, as their army lacked an "air force."
Spinner explained to an enraged Dreypa that they had no riders among their forces and that learning to ride an uvak took months. He also criticized Dreypa for advancing his forces too rapidly, pointing out that their hostages and their guards had not yet caught up with them. Dreypa responded furiously, stating that he could no longer wait, having already been asleep for four thousand years. At that moment, Dreypa suddenly recalled one of his former weapons: the Leviathans, large serpentine Sithspawn capable of draining the life energies of sentient beings. Several of these creatures resided within the crater of Sessal Spire, a volcano on the southwestern coast of Keshtah Minor. Dreypa then commanded his remaining forces to retreat to Sessal Spire.

The Battle of the Marisota Floodplain was initially viewed as a victory by Iliana Hilts, the Lost Tribe's military commander. One of her scouts reported that Lord Dreypa's forces were advancing southwest towards the peninsula leading to Sessal Spire. Iliana dismissed the enemy commander as a fool, as that route led to a dead end. Lord Dreypa and Spinner eventually arrived at the crater of Sessal Spire, with the Lost Tribe's forces in hot pursuit. By that time, Dreypa had apparently succumbed to madness, shouting and screaming incessantly. Dreypa's "madness" prompted Spinner to desert and attempt to negotiate a deal with Iliana and the Lost Tribe. Dreypa then attempted to persuade Iliana to become his consort, but was rebuffed by the Grand Consort, who mistakenly dismissed the Sith Lord as a slave suffering from delusions of grandeur.
She then instructed her troops to cast Dreypa and Spinner into the volcano. Enraged by Iliana's rejection, Dreypa utilized his amulet to summon the leviathans from their hibernation beneath the volcanic crater. These leviathans then emerged, attacking both Dreypa's former allies and his Lost Tribe pursuers. This set the stage for the Battle of Sessal Spire, which resulted in the destruction of Iliana's Tribal forces and the Doomed.
Although not officially named, the Battle of the Marisota Floodplain represented the second conflict of Dreypa's rebellion, which devastated parts of Keshtah Minor in 2974 BBY. Its first appearance was in John Jackson Miller's Lost Tribe of the Sith—Spiral 3, the third comic issue of the Spiral comic story, released on October 10, 2012.