Itchi Kōsen

Taking the "light" of yang, and the "dark" energy of yin, the two people combine both into one condensed ball. The result is an extremely powerful beam that was easily able to wipe an entire mountain, because of each "element's" part in the foundation of existence. It was quickly labeled a kinjutsu by the Daimyo, and was successfully erased from history. The move itself is one that poses a hazard to the two users, as it requires careful concentration, as well as perfect unison in order for it to be pulled. Anything less and the technique could backfire, causing horrible damage and potentially erasing the users' existence.