Hellgate: The three long-range stargates leading to the Ancal Drifts and Koric Expanse constellations, home of the Leviathan Consciousness, an aggressively hegemonizing perversion that will eat your mind-state for breakfast on its way to devouring your entire civilization.  Even civilizations otherwise at war with each other cooperate enough to keep making their contributions to the Leviathan Consciousness Containment Fleet.