Umbara

Umbara, known as the "Shadow World" due to the lack of sunlight on its surface, was a planet located within the Expansion Region. Resting within the occluding Ghost Nebula, Umbara was cut off from the rest of the galaxy. This resulted in the development of advanced technologies that far exceed the galactic standard by the native Umbarans. During the initial stages of the Clone Wars, Umbara was a member of the Galactic Republic, though it would defect to the Confederacy of Independent Systems following the assassination of senator Mee Deechi, who had represented the planet within the Galactic Senate. In response, the Grand Army of the Republic would launch a successful invasion of the Shadow People's homeworld.