Ten hundred thousand years ago, Lu Xuan was forced by human powerhouses with the lives of the Lu family members to guard Tianyuan alone. Ten hundred thousand years later, the Lu family faced the threat of extermination by an eternal family, and his descendant Lu Linglong recalled him from the dying state with her bloodline. Lu Xuan returned to the mortal world, holding the Heaven-Burying Divine Sword to take revenge and protect the clan, and joined forces with Human Emperor Shen Qing to uncover the conspiracy of Huang Jiu colluding with foreign realms. Lu Linglong inherited the Taixu Sword Canon, and everyone finally worked together to reinforce the Tianyuan seal.