Dark Cannon

Dark Cannon (ダークキャノン) is Vanitas's Shotlock in Kingdom Hearts Birth by Sleep. The Vanitas Remnant can also use this Shotlock, and when Ventus uses his Vanitas D-Link, his Shotlock becomes a light version of Dark Cannon named "Dark Link". Dark Cannon generates three crystals in a trigram formation which project rays that fuse and become a giant beam of dark energy.

Kingdom Hearts II
Sora and Riku can use Dark Cannon while performing their Eternal Session Limit. Dark Cannon causes the two Keyblade wielders to fire several bluish-white fireballs at their opponent.