bone shrinking skill, which is a kind of extremely anti sky martial arts or dragon roar told him that once trained into invincible in the world, it also has the function of repairing bone meridians, but it has a fatal weakness. From the date of training, the appearance will never change, but the remaining Yang life is no more than 30 years. This is the retribution against the sky.

as a result, raoshi bone shrinking skill is so powerful that few dare to practice it. Even if you practice it, you will stop at a certain level.

it's enough if you can use it, but you can't practice it. This...