Arc hails from the war-torn planet Murat, once subjugated by an invasive machine intelligence. When Murat falls, Arc joins High Priest Kufu’s guerrilla resistance, spearheading survival efforts for refugees opposing their synthetic conquerors.

After machines subjugate and reshape Astria into a mechanized hellscape, Arc allies with the displaced Astrian royal family. Partnering with fellow robot Beta, Arc escorts Queen Lilia and her twins, Jimsa and Affle, across lethal terrain, evading mechanized hunters. Drawing on tactical expertise from Murat’s wars, the robots deploy strategic countermeasures and survival insights to shield the royals.

Arc aids in reuniting the genetically enhanced twins, whose fused energy-beam abilities temporarily stall the machines. When this fails to secure victory, Arc allies with Il, a cyborg ronin and Murat exile, to orchestrate a final gambit: detonating Astria’s core to annihilate the machine empire. The blast consumes Arc, Il, and the planet, while the twins flee aboard a vessel carrying biological archives to regenerate life elsewhere.

Though Arc perishes in the cataclysm, their sacrifice ensures the twins’ escape, safeguarding organic life’s chance to evolve anew on a distant world.