Csaus represented a celestial body situated within the domain of the Chiss Ascendancy, a government within the Unknown Regions. During an Ascendancy crisis in 18 BBY, Csaus was the location of a battle fought between the Tahmie and Droc families. Admiral Ers'ikaro of the Chiss Defense Force, commanding the Firewolf man-of-war named Bellicose, intervened to de-escalate the situation. Later in the crisis, Csaus was also the site of another conflict.
Within current Star Wars canon, the name Csaus initially appeared in Thrawn Ascendancy: Lesser Evil, a 2021 novel that concluded Star Wars: The Ascendancy Trilogy by Timothy Zahn. Conversely, in the Star Wars Legends continuity, the planet named Csaus was first seen in The Essential Atlas, a reference book published in 2009 by Daniel Wallace and Jason Fry.