The Sphere of Expansion and Diplomacy, also known as the Ministry of Expansion and Diplomacy and the Pyramid of Expansion and Diplomacy, was one of twelve Spheres of Influence of the Sith Empire. Headed by a Dark Councilor, the Sphere was responsible for the expansion of the Empire's borders and all diplomatic relations. The Imperial Diplomatic Service answered to the head of the Sphere, a position that was filled by Darth Ravage during the Cold War.