Rayfly, known as "War Raia" (ウォーライア Wōraia?) in Japan, is a large flying machine boss that is fought in the Locate Giro mission in Area B from Mega Man ZX. It hovers above Vent or Aile and drops three box-like Bounce Cannons to the floor at a time. Destroying the Bounce Cannons is the only way to damage Rayfly, as it hovers out of reach of Model X's weapons. After it is defeated, Vent/Aile find themselves unable to destroy it. Giro appears then and slashes it with Model Z's saber, which makes Rayfly crash to the ground and explode.