C-Sword

C-Sword (abbr. for Crescent Sword), known as Mikazukizan (三日月斬? lit. "Crescent Moon Slash/Three Day Moon Slash") in Japan, is the special technique that Zero learns after defeating Grizzly Slash in Mega Man X5. When the player presses the Attack Button when Zero is in midair, instead of a normal air slash, he will perform a circular slash with his Z-Saber, creating a large, yellow energy crescent in the direction he is facing. Like Kuuenbu from the previous game, C-Sword also allows Zero to double jump, giving him the ability to reach new heights as well as replacing his normal midair slash for the remainder of the game.
Duff McWhalen, Rangda Bangda W's green eye component, and all parts of U-555 are weak to this technique. C-Sword is also effective when fighting against Dynamo and both of Sigma's forms.