Scouring of Nebulos

The Scouring of Nebulos was the final battle of the Great War, a destructive conflict that embroiled the planet Nebulos and ultimately left the planet devastated and incapable of supporting life.

Fiction

Beast Wars: Uprising

The Scouring of Nebulos began with the Decepticon's initial destabilization of the planet in the 21st century. Their agent, a 'con named Zarak, used the Decepticon infiltration protocol to spark a war between the planet's Hive nations at war with the World Watcher alliance. Just as this started however, the Human Confederacy showed up. With their arrival, the war turned hot. The Decepticons quickly forged an alliance with the Hive, their technologies meshing pretty well. Captive Autobots and World Watchers were experimented on by the mad Fausto Borx in hideous fashions, from which the Headmaster technology was born.

Not to be outdone, the Autobots managed to create Headmasters of their own. Soon enough, the team of Teslor and Arcana managed to expand the process to include Targetmasters as well, giving the Autobots the upper-hand in the already destructive conflict... until the Nebulons Fracas and Nightstick defected to the Hive.

In 2031, Fausto and Zarak, already bonded together, turned the city of Kinodia into the gargantuan MegaZarak, the first double-Headmaster. The Autobots retaliated by transforming Cerebros and Spike Witwicky into Fortress Maximus—an awesomely powerful cityformer that took thousands of lives during the course of the Nebulos campaign. A Brush With Infamy–Prologue Head Games

Fortress Maximus and MegaZarak fought, their battle laying waste to what was left of Nebulos, destroying mountains and seas alike. It concluded when the Autobots used Fausto's daughter Llyra as a distraction, allowing Fortress Maximus to win. But the damage was already done. Nebulos had been rendered completely lifeless and would never again support life. A Brush With Infamy–Prologue

The destruction that Fortress and his fellow cityformer wrought proved to be the final straw for the Human Confederacy and its allies, who decided that the Cybertronian civil war was over and forcibly imposed an armistice on both factions. Fortress Maximus and the other Cybertronians responsible for the devastation were subsequently exiled back to Cybertron's new Allowed Zone and forbidden from leaving. Head Games Micro-Aggressions