Shikotsumyaku

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 Drilling Finger Bullets, 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 was the only one to exhibit it out of his entire clan.

Most of the Shikotsumyaku abilities came in the form of bone-utilizing dances named after plants. The most basic of these dances is the Dance of the Camellia, which uses the humerus of either arm as a sword. The Dance of the Willow 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 uses growths of the user's pre-existing skeletal structure to ensnare the opponent and stab them as the bones are growing. The Dance of the Clematis is an attack with two parts, the first being Vine and the second being Flower. 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, 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.