Extinction Protocol. Dominion Earth: The Saurian Wars, #3

The rogue celestial anomaly nears, and time is running out. As the empires war among themselves, the Thagomancer Order, an ancient group of mystics, reveals a final prophecy: only a unified roar from all empires can awaken the Earth's core and shift its orbit to save the planet. But this fragile hope is sabotaged when the nomadic Bloodfang Tribes interrupt the ritual, believing that extinction is not a threat, but a path to rebirth.
This is the final chapter of a saga built on the belief that evolution of intelligence and culture is key to survival. The empires must choose between unity and perishing.