After Sixteen failed to transcend her Fourth Stage Heavenly Tribulation, she was heavily injured. Seven has been looking everywhere for Dragon Bone Withered Vines to cure her but not to avail.
Song Shuhang obtained sixteen Dragon Bone Withered Vines from the White Dragon Tomb on the Mysterious Island. In exchange for the vines, Song Shuhang was requested by a guardian of the Dragon Tomb, Dragon Bone to pour a bowl worth of blood into the crystal coffin.
In return, Seven promised to bring Song Shuhang to the Heavenly River Secret Realm’s first layer.
Links and References