User blog comment:Ygrain/Leviathan: Do you know what you are doing, Bioware?/@comment-4237253-20120915082834/@comment-5306852-20120915193241


 * "That which you know as Reapers are your salvation through destruction." - Harbinger, in ME2

That is foreshadowing. Not explicitly telling you what the reason the Reapers were created is.