The Hyborean Moon functioned as the location of an Imperial black-site prison during the era of the Galactic Civil War; it was a moon. This moon also provided living quarters for Imperial personnel, and was home to popular hot spring lakes used for relaxation. After the Battle of Endor, a New Republic fleet launched an attack against the Imperial installations situated on the Hyborean Moon, resulting in the freeing of the prison's inmates. As a result, Romwell Krass Junior was compelled to escape off-world and go into hiding. The Mid Rim Territories celestial body known as Hyborea shares its name with this moon.