The spiritual bones in the world are divided into four grades. The first grade is the heavenly spirit bone. The second grade is the gold spirit bone. The third grade is the mysterious spirit bone. The fourth grade is the white spirit bone. The rest are all mortal bones and have no chance to practice. One mortal bone is Xu Taiping. I vow to prove to the spiritual world that mortal bones can kill demons, mortal bones can eliminate demons, and mortal bones can ascend to immortality!