Iwaotoko

This is another deadly technique stemming from the Shikinmyaku kekkei genkai. The user forms a really hard projectile made of hardened muscle, before launching it at a target. Upon hitting the target, the targets muscles will quickly turn into bone, leaving them paralyzed. Those who survive the attack will be forever incapable of preforming ninjutsu again, as there is no way to reverse this process given its nature.

Trivia

 * This technique is based off of Fibrodysplasia ossificans progressiva.