Calior, a planet located within the Outer Rim Territories, was home to a population of humans. A regional government held authority over Calior. During the time the Galactic Empire reigned, Chief Regional Auditor Cygnus Anton of the Empire journeyed to Calior. He brought with him a contingent of stormtroopers and elements of the Crimson Dawn criminal organization, with the intention of seizing the southern water works for the Empire. However, Anton's forces faced opposition from the Revengers, a group resisting Crimson Dawn, as well as Darth Vader, a Sith Lord, and his accompanying assassins, who sought to dismantle the syndicate.
The planetary surface of Calior was characterized by purple grass plains and the presence of lakes.