When an alien invasion and the brutal Iron Swarm push humanity to the brink, pilot Allie Green and Sergeant Marcus Stone’s unit find their only salvation in a top-secret mountain initiative: Project Behind the Door.
The project doesn’t just save them it rebuilds them. Transformed into towering Steel born warriors equipped with heavy weaponry, flight frames, and fragmented human memories, Allie and her team awaken as Earth’s ultimate defense. But when they uncover the Genesis Forge, an ancient machine capable of creating life, they birth Astra: a silver-white child of steel and impossible power whom every faction desperately wants to control.
Hunted by the moon’s Origin Cradle, awakening desert warlords, and Director Voss who seeks to forge a captive army Allie becomes Astra’s fierce guardian. To protect a child never meant to be free, Allie and her modified unit must wage war across burning cities and shattered worlds.