The Artifact is showing Castor and Sara things that might change them at their cores. Vra'shek's meeting with his Oblivion Covenant allies goes...about like you'd expect.

Castor continues to be stretched by the Artifact in ways he never has before. The Artifact continues to plant seeds of doubt about Sara. Vra'shek learns that he's not the only one with a secret.

Will Castor make peace with the artifact or will it make pieces of him? Can Sara defect the Krenn? Find this out and more on The Curvature Key!

Sara has finally confronted the truth: the artifact isn’t Zorathian, isn’t understood, and definitely isn’t under anyone’s control. It chooses its hosts… and it remembers them.

High Command has been hiding the real stakes, the real history, and the real danger — and Castor Ames is now at the center of a test older than any empire.

The Krenn has the Book. Castor still feels it pulling at him. And Sara is racing toward a choice she may not be ready to make.

In this episode Castor and Sara continue to learn about each other. But does Vra'shek have the strength to rip the artifact away from Castor?

Sara Sudis detects renewed Krenn activity near the university district. The creature’s thermal inversion signature confirms her worst fear: he’s adapting.

Meanwhile, Castor Ames pieces together centuries of encounters with the “Book of Fire” — from medieval Italy to ancient Anatolia to WWII battlefields. Each account bears the same fingerprint, suggesting the artifact’s presence across time.

The resonance between Sara and Castor reaches critical levels. A kiss. A surge of energy. Proof that emotion may amplify the artifact’s dimensional field.

But field recordings end abruptly with civilian casualties in an alley downtown. The Krenn has begun hunting again.

Sara’s loyalty is tested. Her orders from Zora are clear: eliminate the Krenn if necessary, and watch the human. But Castor Ames isn’t just “the human” anymore—he’s becoming something else. Their connection deepens inside a resonance space where emotion and matter merge, revealing truths neither of them are ready to face. When they return, the impossible follows them home. Back on Earth, Vra’shek stalks closer, and Sara’s own people begin to question her judgment.

Can she follow her orders when her heart has already broken them?

Castor and Sara come to an agreement as to where Sara is from. Vra'shek continues to pursue the artifact. Castor sees a glimpse of the possible future, does he like it or not.