Protheans

Fifty thousand years ago, the Protheans were the only spacefaring species in the galaxy. They vanished in a swift "galactic extinction." Only the legacy of their empire remains. They are believed to have built the mas relays and the Citadel, which have allowed numerous species to explore and expan throughout the galaxy.
Protheans ruins are found on worlds across the galaxy. While surprisingly intact for their age, functioning examples of Protehan paelotechnology are rare. Time and generations of looters have picked their dead cities and derelict stations clean.
Some believe the Protheans meddled in the evolution of younger races. The hanar homeworl of Kahje, for exmaple, shows clear evidence of former Prothean occupation. The presence of a former Prothean observation post on Mars has caused a rebirth of 'interventionary evolutionists' among humans. These individuals beleive the god-myths of ancient civilizations are misremembered encounters with aliens.
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