User blog comment:Ygrain/EDI and the geth: their purpose in the story?/@comment-2186773-20120724072419/@comment-4444176-20120724193320

Am I the only person here aware of the fact that the 'synthetics vs organics' reason was added later on? The creators first wanted the Reaper's existance have something to do with Dark Energy as seen in ME2 on the Quarian planet Tali and her team is on.

The Reapers wanted to prevent this same dark energy, originating from somehwere, from destroyig the galactic community. But in the end it did not explain why the hell the Reapers had been killing all previous civilisations and thus they simply added the stupid 'Synths vs Organs' concept.