Part of the Asumi practices, it was known as the deadliest fighting discipline in the galaxy. Its highest form was known to have only been summoned against a trained equal and was known to be lethal. Even against Vulacn strength, a single blow was capable of killing an opponent despite their races durability. Under natural conditions, the death of an opponent was able to be achieved in seconds.
In the 23rd century, Admiral Savaj and Spock were forced to fight one another using this fighting art due to the actions of the Designers who sought an answer to the Prometheus Design. (TOS novel: The Prometheus Design)