Shadow Runner

"A darkness-based weapon. A boomerang with homing capabilities."

- In-game text

Shadow Runner (シャドウランナー) is what X earns from his victory over Dark Mantis. It is a shadowy boomerang that leaves a dark blue trail that hunts down and spirals around enemies. If there are no enemies about, the weapon merely spirals around the character and returns inside the character's body in a puff of black smoke. Charged up, it sends out five black boomerangs. This weapon is Gravity Antonion's weakness, and it's also very useful against Copy Sigma and Lumine's second form. 