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The Reapers are an extremely advanced race of synthetic warships that reside in the unexplored region referred to as Dark Space, the empty, starless space between galaxies. They hibernate there, dormant for thousands of years, before they are given the signal to return. Their origins are completely unknown. The only Reaper known to have communicated with organic life, Sovereign, claimed that the Reapers have neither beginning nor end - "we are eternal, the pinnacle of evolution".