The spine and coccyx of Xuanyuan Huangdi. According to the query of "Wind and Cloud" film and television information. The dragon vein is an important prop in "Wind and Cloud". It is the spine and tailbone of Emperor Xuanyuan Huang. It can suppress the luck of the Nine Provinces and can also help Nie Feng suppress the demonic nature in his body. Therefore, the dragon veins in "Wind and Cloud" are the spine and tailbone of Emperor Xuanyuan Huang. "Wind and Cloud" is a costume fantasy martial arts drama directed by Xu Jinliang and starring Zhao Wenzhuo, Peter Ho, Shinichi Chiba, Wang Xi, Tao Hong, Wu Chenjun, Jiang Qinqin, Jiang Zuping, Sun Xing and others.