- "We believe the Zhell were Humans — perhaps the original Human population that took to the stars when Imperial Center was known as Notron."
- ―Mesh Burzon
The Battalions of Zhell came into dominance on Coruscant by waging war on the Taungs for centuries. During one of these battles, the Battalions of Zhell suffered a near extinction level defeat when a volcano destroyed their main city. The volcanic ash would fill the skies of Coruscant for two years, so that the Taungs adopted the name Dha Werda Verda or the "Warriors of Shadow" for themselves. The battle was immortalized by an epic poem with the same name.
The Zhell eventually recovered and drove the Taungs offworld—the Taungs fled to Roon. Since Coruscant was considered by some to be the homeworld of Humans, several historians hypothesized that the Zhell species may have been the ancestors of the Human race in the galaxy. The name Zhell may have inspired Zhellday in the Galactic Standard Calendar.
- Shadows of the Empire soundtrack (Liner notes) (First mentioned)
- The Essential Guide to Planets and Moons
- The Essential Chronology
- Coruscant and the Core Worlds
- The New Essential Chronology
- The Complete Star Wars Encyclopedia
- The Essential Atlas
- (Mentioned only)
- The Unknown Regions
- Book of Sith: Secrets from the Dark Side
- The Essential Guide to Warfare
- Star Wars: Imperial Handbook: A Commander's Guide