The discovery of an ancient sword casket deep in a frigid pool shatters the sixteen years of quiet obscurity in the life of Mu Yun, an errand disciple of the Taiyi Immortal Sect. When the sword spirit Xuan Li awakens inside the green jade casket, nine streams of sword energy shoot into the heavens. The disturbance not only rouses the sect's patriarch, who has been in seclusion for a hundred years, but also causes the Nine Luminaries star chart to appear in the sky. The spiritual energy tide, which returns once every three thousand years, has surged a century ahead of schedule.
Born with a Primordial Chaos spirit root and a dragon-shaped birthmark, the boy breaks free from the shackles of fate. Deep in the Hundred Thousand Mountains, he and Su Yingxue, the foremost disciple of the Medicine Immortal Valley, explore a Wu clan altar and witness the bloodcurdling wails of demons transforming into human form. In the East Sea's Guixu secret realm, he works with Nangong Yue, a true disciple of the Heavenly Secrets Pavilion, to chart the celestial cycles and uncover an apocalyptic prophecy sealed in the bloodline of the mermaid princess Lan Yi. And the Soul-Eating Blade of Leng Qianjue, saintess of the Nine Hells Demon Sect, which was held to his throat, becomes a karmic fire lotus that cuts through his inner demons at the moment of life and death.
Twelve innate spiritual treasures reappear in the mortal world, and the celestial sign of the Nine Luminaries aligned tears apart the barrier between the three realms. When the remnant body of a demon god rises from the end of the Nether River, Mu Yun finally realizes that the Primordial Beginning sword casket in his hands is a god-slaying weapon, forged by the ancient Sword Sect as an offering of the lives of its entire sect. And in Xuan Li's gradually returning memories, the white-robed sword immortal whose face bears a striking resemblance to Mu Yun points to the truth behind the devastation of the primordial world, hidden in the deepest secret of Mu Yun's dragon-shaped birthmark...
