Rhelg was a noteworthy world affiliated with the Sith. In the time of the Galactic Republic, Rhelg was quarantined along with other planets like Malachor, Ziost, and Jaguada, and its history and Sith affiliation was hidden.
In the new Star Wars canon, Rhelg was first mentioned in the 2019 reference book Star Wars: The Rise of Skywalker: The Visual Dictionary, written by Pablo Hidalgo. In the Star Wars Legends continuity, Rhelg was introduced in the comic Tales of the Jedi – The Golden Age of the Sith 4, written by Kevin J. Anderson, penciled by Dario Carrasco, Jr., and published by Dark Horse Comics in 1997.
- Star Wars: The Rise of Skywalker: The Visual Dictionary