User blog comment:The Milkman/Reaper Logic/@comment-2127388-20120425203841/@comment-5030249-20120426021856

The Protheans didn't know about Glitter Child. Protheans or a cycle previous to them, discovered the problem with the Crucible not having the yield to destroy all the Reapers in the Galaxy and hit upon the idea of using the Citadel and Mass Relay network to amplify the output, kind of like tossing Gasoline on a fire.