Kylone (a play on "clone") was a planet used by Exhart Martineus to build a facility for producing clone troopers to be used in his army to assist the Grand Army of the Republic during the Second Clone Wars. Being unciviled, untouched and far away from the grasps of the Society, this planet was the most perfect "big rock" to be used by Clone Army to breed and train millions of clone troopers.