Two worlds were never meant to survive.

Sixty-six million years ago, the Chicxulub asteroid should have ended the age of dinosaurs. Instead, something changed history-and an impossible Earth endured.

Now that forgotten mistake is breaking open.

Aboard modern-day Helix, Kameron Jonas watches as the ancient asteroid begins appearing above Earth. In the Eternal Cretaceous, his son Levi stands inside Site Primus, a facility older than humanity itself, where a growing Temporal Wound threatens to tear two histories together.

But the crisis beneath the mountain is only beginning.

Across the endless plains, the Sahulin have rediscovered the Ghost Runners-their long-lost evolutionary cousins. Generations of mistrust are erupting into violence, forcing Saar and Kharu to choose between the peoples who shaped them and a bond neither civilization fully understands.

As predators descend upon a world already at war and Site Primus begins to awaken, Levi discovers the terrible truth:

Saving one Earth may require sacrificing the other.

With the Omnaris Suit reacting to forces beyond human understanding and the asteroid slipping between histories, Levi must make a choice no one should possess the power to make.

Because extinction was never just an event.

It was a decision.

And this time, two worlds are waiting for the answer.

EXTINCTION CODE: PRIMUS IMPACT

The Eternal Cretaceous reaches its end.