Shikotsumyaku

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Shikotsumyaku (屍骨脈; Literally meaning "Dead Bone Pulse") is the Kekkei Genkai of the extinct Kaguya clan, which gave them the ability to manipulate their own skeletal structure. They had free control over the cells responsible for bone growth and replacement, allowing them to manipulate their bones at will. They could protrude their bones out through their skin with any injuries that would be received during this process healing instantly, change their bone density, and could even completely regenerate a lost bone. An example of this is seen with the Finger Bullet Drill (十指穿弾, Teshi Sendan), which fires the user's fingertip bones like bullets. All this makes their bodies virtually indestructible, and any point of contact on the body could become as sharp as a spear tip, giving them a nearly perfect defense. The ability seems to be rare amongst the clan members, as Kimimaro Kaguya was the only one to exhibit it out of his entire clan. The reason for this could be because the rest of the clan was very barbaric in which he was not.

Most of the Shikotsumyaku abilities came in the form of bone-utilizing dances named after flowers. The most basic of these dances is the Dance of the Camellia (椿の舞, Tsubaki no Mai), which uses the humerus of either arm as a sword. The Dance of the Willow (柳の舞, Yanagi no Mai) uses extensions of bone from the body to attack the opponent, coupled with large amounts of acrobatics to increase the attacks' effectiveness. The defensive Dance of the Larch (唐松の舞, Karamatsu no Mai) uses growths of the user's preexisting skeletal structure to ensnare the opponent and stab them as the bones are growing. The Dance of the Clematis (鉄線花の舞, Tessenka no Mai) is an attack with two parts, the first being Vine (蔓, Tsuru) and the second being Flower (花, Hana). With Vine, the user rips out their spinal cord and use it to trap the opponent. Once immobile, the user uses Flower to form the body's strongest bones into a giant drill on the user's arm to crush the stationary opponent. The final dance, Dance of the Seedling Fern (早蕨の舞, Sawarabi no Mai), creates a giant forest of bone spikes that emerge from the ground and impale the opponent. The user can also travel and emerge through these bone spikes at will.