The Stewart of the Realm manages the connections with other groups in the galaxy. He is an enforcer of the Treaty of the Cataclysm and has the ability to walk through space and time.
The Silver Sovereign is the ruler of The Silver Realm and has the ability to walk through space and time.
The Silver Realm is a group of some of the planets from the lost galaxy of S'Liert located beyond the great abyss off of the Tyrian Galaxy's Section 13.
The Defender of the Realm heads all of the military units of the Realm. He has been locked in battle with the Dark Warrior for control of the remnant of the Silver Galaxy - the last holdout of the Dark Forces from the times before the Cataclysm.