This may be something I never understood, or maybe I'm just forgetting a plot point from the first game, but why did Saren care about stealing the Beacon at the beginning of Mass Effect 1? We later learn that the Beacons were warnings from the Protheans about the coming of the Reapers, but of course Saren already knew about the Reapers. In a big way.
Was he just trying to deny the Council races the warning, so they couldn't prepare? Or was there another purpose to the Beacon? He describes Eden Prime as a "major victory," and Benezia adds that it brings them "one step closer to the return of the Reapers." That's an odd claim if the only thing they accomplished was to destroy a message in a bottle, especially since Shepard had already accessed the beacon by then. If their goal was to destroy the information, that seems like a pretty clear defeat to me.