The Tanausan Imperium was a Dark-aligned empire near the galactic border of the Large Magellanic Cloud. They were among the three major antagonists of the Dawnbreaker War. The empire existed for over two million years during the Dark's reign of terror until it was decimated by an event known as the Great Retrograde at the end of the war. Though an attempt was made to hold on to the dying empire, it was eventually brought to an ignoble end when the last emperor was killed in the orbital bombardment of the planet Duhelen by the New Tanausan States.