Kotsuhaiku

By flowing normal chakra through unique chakra produced by the Shikotsumyaku kekkei genkai, the user can expel pulses or throw punches capable of penetrating the body and harming the skeletal structure of the opponent, severely weakening it and making it even more prone to fracture with each ensuing strike. Due to its effects, if preformed enough, it will be in the targets system for as long as the live. Due to its nature, there is no cure.

Trivia

 * This technique is based off of Osteogenesis Imperfecta