I think it is likely one of the other races could of came up with the crucible, extermination of intelligent life would take time. Some more militant galactic societies could of taken decades.
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Edited by Ogma: Destroyer of Worlds: 1/10/2016 4:20:46 PMI just don't see how any race would have known about the Catalyst or that the Citadel was a giant mass relay. The Catalyst tells Shepard he/she was the first organic to ever reach that point and the entire Reaper cycle is based in surprising the galaxy by jumping in at the Citadel. No one else could have known these things so they couldn't have made a device that hinges on that knowledge. It just doesn't make sense. It's either something like what I suggested or it's bad writing.