Nintaikenjutsu

Nintaikenjutsu (忍体 術, Ninja Body Sword Techniques) is a unique form of jutsu utilized by Kan Korimachi and is said to be the ultimate expression of and  used in unision. It not only enhances and augments the users body, strength and physical attributes, but their kenjutsu as well, creating a synergy that surpasses both arts by exponential magnitude of tiers. Because it can be combined with fuinjutsu, chakra flow, and even genjutsu, it makes the user exponentially dangerous on the battlefield. Besides Itaidōshin Hyakumanki Yakō, is is unknown if any other types of Nintaikenjutsu exists.