Oikage

Oikage (追影, Seeking Shadow) is the Final Secret Sword Technique of Ikki Kurogane.

Description
Oikage is a technique Ikki had developed after his seven secret sword techniques in the final of the Seven Stars Sword Art Festival to defeat Stella, thus making it his final secret sword technique. Oikage is a battoujutsu, which doesn't a sheath as his Intetsu doesn't have one, instead, Ikki uses his hand in a manner that similar to a sheath and does so after first using his Ittou Rasetsu, afterward unleashes a slash that moves at extreme speeds to the point where his shadow was unable to keep up and is described as being the "concept of a slash".

Alongside his improved usage Ittou Rasetsu, through focusing the strengthening on the most needed parts of him instead of his whole body, putting the excess power into his Intetsu; he could also use his powers as a Desperado to influence the causation of "killing" letting cut through Iris' nigh-invincible Orichalcos.

Weaknesses
Differing from his original secret swords, which Ikki became able to use after leaning Edelweiss' Swordplay where he initially needed Ittou Shura, he needs Ittou Rasetsu to be able to use Oikage, as well as the same motions.

Users

 * Ikki Kurogane

Trivia

 * Oikage is stated to be the peak that other people have attempted to reach.