The Kagenui is a ninja sword in Final Fantasy XII. Its license costs 40 LP in the original ans 100 LP in the Zodiac versions where it can be used by the Shikari. As it is not possible to unlock all ninja sword licenses in the same board in the Zodiac versions, the player could forgo Ninja Swords 1 that Kagenui is part of.
Kagenui is a weapon.
Kagenui is Japanese for "shadow sewing" or sometimes can be referred as "shadow binding".