User blog comment:Legionwrex/Harbinger vs Sovereign./@comment-4888821-20120508162942/@comment-4899903-20120901035255

Alexsau1991 He does it near the end of Mass Effect 3 when you're running to the big Conduit beam.

I personally think Harbinger on the basis that he is much more powerful and older, however Sovereign is far smarted and tactful. Though Harbinger, spoiler alert, is the very first Reaper so I imagine he has some form of command.