The Trailians were a sentient, humanoid species of great beauty. Native to the Outer Rim planet Trailia, they had developed a low technology society by the time of the New Republic. During that period, Cronal, one of the Emperor's Hands, established a laboratory on the planet and experimented on Trailian subjects, turning the once peaceful individuals into ferocious warriors. Those creations were unleashed on nearby worlds before being defeated by a group of offworlders.