User blog comment:Elseweyr/Mass reading for best Effect – Introducing the Mass Effect Book Club/@comment-5619827-20140326214822/@comment-9753034-20140329012726

Sovereign "taking control" of the Prothean beacon on Eden Prime? Hmm. Saren uses it, Shepard uses it, beacon explodes, and Saren learns from Benezia that Shepard may have used it. The only thing to come from the beacons are the visions, and Saren himself is likely Sovereign's primary link to the surrounding world.

Back to the Monolith: we don't really know parts of a Reaper itself to be capable of anything at all, do we? They're not just individually working mechanical pieces assembled into giant ships. The dragon's teeth may transform humans into husks, but the victims retain their shape, the process merely replacing some stuff with cybernetics.

One way or another, however, the Reapers indeed seem to have made it into Harper's mind. Implications unpleasant.