Late in the Clone Wars, the planet was heavily contested until a Separatist victory was achieved due to the use of the Scorpenek annihilator droids. During the reign of the Galactic Empire, the Imperial officer Quirt would collect criminals off of the streets of Formos and ship them off to Kessel to work in the mines there.
- Way of the Wookiee (First appearance)
- Star Wars Roleplaying Game Revised Core Rulebook
- The New Essential Guide to Droids
- The Complete Star Wars Encyclopedia, Vol. I, p. 290 ("Formos")
- The Essential Atlas
- Star Wars: Edge of the Empire Core Rulebook