The Interstellar Dominion is the dominant political, economic and military power in the . While it claims sovereignty over all of the Trillian Sector, the unstable nature of the region means that the Dominion's dominance really only extends over a smaller but still substantial group of star systems. The bulk of the Dominion's influence is on a group of "core systems" including the planets within the Credillia, Locus, and Balvorine systems.