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 hunts down enemies, or spirals around and returns if there are no enemies about. Charged up, it sends out six black boomerangs. This weapon is Gravity Antonion's weakness, and it's also very useful against Copy Sigma and Lumine's second form.