The Reapers are the original creators of the Citadel and the mass relay network.
In the end, the Reapers spare little concern for whatever labels other races choose to call them, and merely claim that they have neither beginning nor end. 'Reapers' was a name bestowed by the Protheans, the previous galactic power fifty thousand years before, and the geth refer to them as the Old Machines. These giant machines are ancient their true name is unknown. They hibernate there, dormant for fifty thousand years at a time, before returning to the galaxy. The Reapers reside in dark space: the vast, mostly starless space between galaxies.
The Reapers are a highly-advanced machine race of synthetic-organic starships.
