The Phosphorus Arrow (鷹麟の矢 Ōrin no Ya?) is an arrow guarded by the Makai of Kantai and was made from the feathers of the Phosphorus Bird (鷹麟鳥 Ōrinchō?). During the solar eclipse, the arrow must be shot into the barrier separating the world of the Horrors and the world of humans to prevent darkness entering the human world. However, if it draws blood during that event, it would revive the demonic Legules tribe. The Arrow possesses power to enhance and strengthen a Makai Knight's armor as seen with Garo's armor when he fought Legules. That feature, however, was never mentioned by the Makai Priests.