Mrlsst was the only planet in the sector with an indigenous alien race. It was a moist and humid world, with terrain dominated by marshes and sandy swamps. Nearly everywhere, one could find the towering greenstalk plants that grew all over the planet, except the poles.
A thick asteroid field surrounded the planet, which was used for raw materials and was the location of several research stations.
The first contact between the Mrlssi and Humans occurred sometime before 7000 BBY. Mrlsst joined the Galactic Republic shortly thereafter. Canny Mandary Bertar represented the planet in the Galactic Senate, and after the Republic was reorganized into the first Galactic Empire, the Imperial Senate.
Thousands of years ago, the planet's continents were unstable, resulting in frequent groundquakes and tidal waves; the natives became used to losing possessions amidst such disasters, and came to appreciate knowledge as a result. The planet had grown much more stable by the time of the Galactic Civil War, but the tradition of learning endured among the Mrlssi.
It was while en route to Mrlssi that the Margrave Octan's colonial transport from the Darpa sector, the Sun Runner, vanished c. 4000 BBY, when it attempted to make a supply run from the nearby jungle-moon Nallastia only a week after the colonists arrived on the Fondor satellite. The ship and its three precious power gems—known thereafter as the Lost Stars of Nallastia—were not found in subsequent searches until 23 BBY, when, in fulfillment of an ancient deathbed prophecy, they were discovered by Jedi Knight Obi-Wan Kenobi, with the help of the Margravine Quenelle, a descendant of the Royal Octans of the Darpa sector.
Shortly after the Battle of Endor, the planet was the site of a battle between Rogue Squadron and Imperial Captain Loka Hask for the control of Phantom Project, a new cloaking device technology. Hask was eventually defeated, but the planet suffered heavy casualities.
Behind the scenes
- Star Wars Adventures 1: Hunt the Sun Runner (Mentioned only)
- The Cestus Deception (Mentioned only)
- (Mentioned only)
- X-Wing Rogue Squadron 1 (First mentioned)
- X-Wing Rogue Squadron 2 (Mentioned only)
- X-Wing Rogue Squadron 3 (Mentioned only)
- Star Wars: X-Wing Rogue Squadron: The Phantom Affair (First appearance)
- Star Wars: X-Wing Rogue Squadron: The Warrior Princess (Mentioned only)
- Star Wars: X-Wing Rogue Squadron: In the Empire's Service (Mentioned only)
- X-Wing: Isard's Revenge (Mentioned only)
- The New Jedi Order: Dark Tide I: Onslaught (Mentioned only)
- The New Jedi Order: Agents of Chaos II: Jedi Eclipse (Mentioned only)
- Lords of the Expanse
- Player's Guide to Tapani
- The Essential Guide to Planets and Moons
- "ComicScan: Comics That Almost Were"—Star Wars Galaxy Collector 4
- Alien Anthology
- "Who's Who in Rogue Squadron"—Star Wars Insider 59
- Coruscant and the Core Worlds
- Ultimate Alien Anthology
- The Official Star Wars Fact File 2 (HOT2, Hoth)
- The Complete Star Wars Encyclopedia
- The Essential Atlas
- Galaxy of Intrigue
- Star Wars: Edge of the Empire Core Rulebook
- Enter the Unknown
- Star Wars: Age of Rebellion Core Rulebook