Sovereign (also known as Nazara) is the true main antagonist in Mass Effect. He is a member of an ancient race of evil, sentient starships called the Reapers who want to assimilate all the other organic life in the galaxy. It is controlling Saren Arterius, and wants him to find the portal called "The Conduit" which will allow Sovereign and its fleet to launch an attack on the Citadel. It is known for its tremendously deep and intimidating voice, which was provided by Peter Jessop.