Three kinds of animals can't wear it.

1, not suitable for piercing dragons. Because many people speculate that the magic weapon is the ninth son of the dragon, and the magic weapon belongs to the dragon, and the two dragons will attack each other, which will bring bad influence to the wearer. 2. People who belong to rabbits can't wear them. This reason is a saying in human marriage that "the rabbit cries when it sees the dragon king". The owner of the rabbit can't wear it, and it will collide with it. People who belong to the tiger can't wear it. This statement is based on the fact that in ancient times, it was a very fierce and violent beast, so there was a "dragon and tiger, and there must be a wound."