Former Earth colony, classified as a dead world under quarantine. Cythera was the test site for the Reaper nanomachines, a weapon designed to lay siege to a world without destroying its industrial capacity. After an inconclusive test (of which the details are mostly unknown) on Cythera, the Reaper project was abandoned. The sole survivor of the experiment, a woman known as Grey, would be killed years after by Kienan Ademetria.