This magic allows the caster to control his calcium so he can create bones stronger than steel. It also gives him the ability to arrange his skeletal frame to his liking, this magic is dangerous because not only does this magic turn the user's bone hard to avoid getting his bones broken, it also grants them the ability to control the speed and growth of their bones as well as the calcium's deposit. This allows him to create weapons of bones that can either protrude from any part of the body, or pulled out and used like hand held weapons. He can even fire pieces of their bones as long-ranged projectiles fire pieces of their bones as long-ranged projectiles. Any bone that he remove from the body immediately regenerates, as does the skin that is damaged when the bones are removed. Users can increase the density of the created bones, making them stronger than steel.
Shinigami Trick: Skull Bomb surprise!: Max shoots doezen skull-balls from his palms, these balls are as hard as steel. Though they don't explode in contact, the feeling when hit is still like an explosion. Shinigami Trick: Death eater: Max Transforms his jaws into hard exoskeletons to increase the crushing power. Shinigami Trick: Iron Fist Attack: Max covers his fists with hard exoskeletons that increases his attack's power.