Iai

is a power possessed by Nanashi.

Description
"Iai" allows Nanashi to cut almost anything with a single swing of his sword, creating destructive slash waves by rapidly un- and re-sheathing his blade. For instance, he can easily cut an Earth Crawler despite its protective mucus, or split a Gray Demon's explosive dark beam in two.

Techniques

 * An instantaneous vertical sword slash that creates a slicing shockwave against an opponent. The attack was potent enough to finely slice the breathed-out energy blast of a Gray Demon and kill the demon itself in an instant.
 * With a simple horizontal swing of his sword, Nanashi generates a slash wave capable of cutting through several "buildings" of the Demon Realm around him.
 * Nanashi adopts a stance, his sword held out in front of him, pointing down, before launching a series of flying slash waves.
 * Nanashi adopts a stance, hiding the length of his blade behind his body, only the pommel visible, before performing an incredibly fast, forward sword swing that launches a powerful slash wave, which was successful in destroying Lancelot's bow.
 * Nanashi creates a giant cross of light in front of himself, visible from a far distance, before performing an almost instantaneous X-shaped slash, unleashing it as an immensely powerful attack. Described as his strongest and most secret technique, "Setsuna Jujisei" was powerful enough to once gravely wound Arthur Pendragon, yet it proved powerless before Lancelot's own innate power.

Trivia

 * "Iai" is an abbreviation of the word, which is a combative quick-draw sword technique originating from 8th-century Japan. This art is evident from Nanashi's attacks, as he swiftly re-sheathes his blade after each attack, and some of the stances he has taken while performing them.