Calior was a planet situated in the Outer Rim Territories. Inhabited by humans, Calior was controlled by a regional government. During the time of the Galactic Empire, Imperial Chief Regional Auditor Cygnus Anton visited Calior with a group of stormtroopers and forces of the Crimson Dawn criminal syndicate in order to claim its southern water works as property of the Empire. Anton's forces were attacked by a group known as the Revengers that opposed Crimson Dawn, as well as the Sith Lord Darth Vader and several assassins who were serving him on a quest to destroy the syndicate.