[[Image:|260px]] Cluster View SystemsN/A RelaysN/A Location: Milky Way / Styx Theta Prerequisite: Noveria: Geth Interest (Mass Effect) The Styx Theta cluster likely derives its name from the river Styx, which divided the Earth from Hades, the underworld. The systems in this cluster are also named for other geographic aspects of the ancient Greek underworld. The cluster lies uncomfortably close to the "Five Kiloparsec Ring" around the galactic core. Much of this area is too dangerous to safely travel. Styx Theta can only be reached from a mass relay within the Horse Head Nebula.