"I am Sovereign"

While assaulting Saren's Base, Commander Shepard & his squad confront Sovereign and realize that it is in fact a Reaper, rather than a Reaper ship. Sovereign confirms this, stating that the title was given to them by the Protheans, whom the Reapers exterminated 50,000 years ago. As Sovereign states, the Reapers "are the End of Everything."

Example of:
Precursor Killers