Star Crash

Star Crash (スタークラッシュ) is Star Man's special weapon. The weapon creates a star-shaped barrier around the user for protection, and it can be shot at enemies. The shield can resist only one hit.

Capacity
In Mega Man 5, the Star Crash doesn't use weapon energy when activated, using 3 weapon energy units if the shield is hit while protecting the user or 2 units if it's thrown, and can still be used if less than the amount of energy required remains. With a full weapon energy gauge, it can be shot 14 times or used as a shield 10 times.

Bosses weak against Star Crash

 * Mega Man 5: Gravity Man, Dark Man 4, Wily Press
 * Mega Man (Game Gear): Bright Man

Other media
Mega Man uses Star Crash in episode 22 of the Mega Man animated series. In the cartoons, its chamber is shaped like a star, probably to generate the energy star.