Sword of Dark Space

The Sword of Dark Space (暗い空間の剣 lit. Kurai kūkan no ken Viz. Dark Blade) is a weapon used by Houou, and was previously owned by an unknown ninja that he killed in battle.

The Sword of Dark Space is a curved, long nodachi with a black edge produced by what Houou calls "Physical Shadows". The blade is capable of repairing itself when broken by simply being immersed in shadows.

The weapon has a unique power; when fighting an enemy, Houou is capable of using the weapon to injure the opponent by striking their shadow. Wherever the blade pierces an opponent's shadow, an identical injury will appear on the opponent's body.