What If: The XIII Legion Meets the Justice League
The skies above Earth tremble, not with thunder—but with war.
A rift tears through the fabric of reality, stitched by ancient warp energy and psychic backlash from a failed ritual in the Eye of Terror. Out of this void emerges a fleet clad in cobalt and gold: the XIII Legion, the Ultramarines. Led by the primarch Roboute Guilliman himself, they do not come in peace—they come under the belief that this world, this “Terra,” is a lost human colony corrupted by xenos influence and sorcery.
Standing against them: Earth’s greatest champions—the Justice League.
The initial contact is disastrous. Superman intercepts an orbital drop pod over Metropolis, only to be struck by a plasma lance that momentarily stuns even him. Batman, tapping into Watchtower surveillance, immediately recognizes the threat is not just technological—but strategic, disciplined, and ancient.
As Roboute Guilliman steps onto Earth’s soil and declares it under Imperial Compliance, Wonder Woman draws her blade. Flash flinches at the sheer precision of Ultramarine formations. And Green Lantern’s constructs shatter against the iron will of the Emperor’s finest.
This is not a misunderstanding.
This is war.