Rasetsusen

Rasetsusen (translation needed) is the attack Zero learns upon victory over Dark Mantis. It is similar to Kuuenbuu, C-Sword, and Ensuizen, in that it does a spiralling attack while airborne, and is a real blast if you have Sigma Blade or D-Glaive equipped.

If K-Knuckle is equipped, Zero does another homage to the Street Fighter series--the Senpuukyaku (take a wild guess what this does!).