The Sith cloak technique was power that drew upon the dark side of the Force. When used it would produce a bubble that would cover a person or object, making it invisible to both the eye and all scanners. It took immense power and concentration to create and maintain the bubble, and if the creator broke their concentration for even a second it would disappear. Most users could only produce a bubble large enough to hide a small group of people or sometimes a fighter, though Vrool Katare was able to hide an entire temple using the technique.