Edo is a former Eastern Bloc system on the southwestern frontier of human space along the Arachnid Quarantine Zone. It was devastated first by the Vin Shriak in 2252, and then again by the Caal in 2264. The human population was essentially wiped out between these two invasions, and most of Edo's cities now lie in ruins.
Briefly grandfathered into the Terran Republic, Edo remained barely inhabited, mostly by scavengers sifting through the wreckage for anything worth salvaging or stealing, and later by smugglers and pirates in need of a hideout. By 2276, the Bugs had spread to and infested the empty planet, driving out what few humans remained.