Mass Effect Reapers Explained: Full Timeline From Origin To Invasion

The Reapers are the main villains throughout the entire Mass Effect trilogy, but their history begins long before the events of the first game.

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Mass Effect: All Planets With Reaper History

In Mass Effect, why do the reapers do what they do (i.e harvest human beings)? What is their primary motivation? - Quora

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Reaper, Mass Effect Wiki