The Great Exodus was an event in Imperial history, occurring in 750.M41. Eldar forces consisting of six entire Craftworlds appeared in the Argos System and vanished with a mysterious swirling celestial phenomenon previously seen in the area. The event extinguished all suns within sixty light years, threatening human worlds. The Imperial Fleet, Imperial Navy, and other innumerable transports undertook a vast evacuation of the System, transporting billions of citizens and infrastructure. It is estimated that 12% of the population and 32% of the heavy industry in the System were safely transported. The ring of dead planets has since become known as the Deadhenge, a salvager's paradise and refuge for pirates.