User blog comment:AdmiralPedro1stFleet/Explaining the Origin of the Reapers (assuming the Catalyst is just Harbinger trying to indoctrinate Shepard)/@comment-68.145.117.128-20140602043934/@comment-203.116.187.1-20140602072706

(nitpick) Reapers are giant metallic death AIs, referred to as machines multiple times throughout all three games. I'm pretty sure that they're synthetic.

Yeah, they're made of organics dissolved into genetic material and processed into metal. By the same token, oil is made out of dead dinosaurs - last time I checked, gasoline is a synthetic product, just like plastic. (/nitpick)

Otherwise, interesting view of the IT.