The user causes his own bones to harden and brings them out directly through the skin, turning his skeleton into a weapon. He hurls these bone growths at the target from his palms or from his back, like projectiles. Having pierced a living organism, such a bone triggers a chain reaction of decay: both the bone itself and the victim's body break down at the molecular level, until nothing remains of the target but a handful of ash.
The technique can be used in different ways. The bones can be used as a long-range projectile, combining them with portals to pierce the target from two sides simultaneously, or they can be brought into play in close combat.
Techniques of the "guaranteed kill" category can sometimes still be survived if the victim possesses exceptional endurance. Here it is different: a hit means death without exceptions, and the name of the technique fully justifies itself.