The Great War

A bloody galactic war that lasted for seventy-three years, killed and estimated two-hundred-and-five billion people, and ended in the creation of the Pax Imperium and a reset of the calendar, with the new era dating from the day hostilities ended.

The Cataclysm

The Cataclysm is the name for the destruction by asteroid of forty-three inhabited worlds in the Great War that ended with the formation of the Pax Imperium.