Crescent Moon Blades

Complementing his Moon Breathing, Kokushibo's Blood Demon Art allows him to create and manipulate dozens of sharp blades shaped like traditional crescent moons from his flesh katana. Created from his blood, they can be either a bright yellow or a bright blue in color. These crescent moon blades are innately chaotic, constantly changing in size, direction, and speed, making Kokushibo's attacks extremely unpredictable and unreadable as they have no set pattern. This greatly enhances the power of his techniques, making every single one of his sword swings extremely deadly and dangerous. He also seems to be capable of using his Blood Demon Art as long as his katana is unsheathed, allowing him to create crescent moon blades even without swinging his sword or unleashing a technique. The volatile nature of his Blood Demon Art makes it extremely challenging for Demon Slayers to circumvent; Sanemi stated that if not for his years of experience in the field of demon hunting, he wouldn't have been able to defend himself from Kokushibo's attacks.

Kokushibo's Blood Demon Art have a secondary ability that allows him to manipulate the shape and range of his sword slashes when unleashing his Moon Breathing techniques. His slashes usually create and are surrounded by a pink or orange crescent shape that carries his crescent moon blades. Kokushibo seems to be able to control said slashes to a certain extent, increasing their range and shape to attack his target in impossible ways under normal circumstances. When he distorted his katana into its branch-like appearance, his slashes turn into a light purple color. Kokushibo also displays the ability to exponentially increase the range of his sword slash with his Moon-Dragon Ringtail technique and shape his slashes into a circular drill-like shape with his Drilling Slashes, Moon Through Bamboo Leaves technique.