Although called an arrow, it's actually a powerful spiritual spear. In its dormant form, it appears as a double-bladed short sword. Made from the feathers of Ourin (鷹麟鳥,Ōrinchō, lit. "Phosphorus Bird"), the arrow is guarded by the priests and knights of Kantai. 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 from entering the human world. However, if the arrow draws blood during that event, darkness could overcome the land. In the past, Legules wanted to take advantage of the eclipse and bring darkness to the world. However, the arrow was used to destroy the barrier and bring light to the world. Over time, it became a routine custom called the Demon Suppression Ceremony. Not many realize just how important and consequential the ceremony can become if something would to go wrong. With Legules defeated by Garo, it is unclear is the arrow still needed.
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Appearance-wise, Phosphorus Arrow's true form greatly resembles Seven-Branched Sword (though it has 8 branches in total).