In ancient times, after the Yellow Emperor defeated Chi You, he discovered that although Chi You was dead, his "immortal heart" was still beating. This heart can absorb the dragon energy of the earth and resurrect the ancient demon god. The Yellow Emperor then ordered the Nine Heavens Xuannv to set up the "Nine Stars Locking Dragon Bureau" to divide Chi You's heart into nine pieces and suppress them at the source of the nine dragon veins in the world (i. E. Under the nine emperors' tombs). These nine fragments are called "dragon bones".
