Rhelg was the planet of Ludo Kressh's private fortress during the Great Hyperspace War and was one of the five sacred worlds of the Sith Space, along with Ziost, Khar Delba, Krayiss II, and Korriban. Those five planets were linked by the looping hyperlane called the Nache Bhelfia—Rhelg fell between Khar Delba and the homeworld Korriban on the route.
- Tales of the Jedi – The Golden Age of the Sith 4 (First appearance)
- Lost Tribe of the Sith: Paragon (In flashback(s))
- The Complete Star Wars Encyclopedia
- The Essential Atlas
- Book of Sith: Secrets from the Dark Side
- Star Wars: Force and Destiny Core Rulebook
- Star Wars: Build the Millennium Falcon 82 (Guide to the Galaxy: Moraband)