Deep in the boundless sea of stars lies the Star Ruins, where ancient cultivators met their end. Legend has it that three thousand fragments of divine swords float within, and that they can forge an unparalleled sword path that reaches the Heavenly Dao. The impoverished youth Mu Qingxuan emerges from the Dragon Burial Abyss, carrying a born sword bone, only to be hunted by the Blood Fiend Hall. At the brink of death, he unexpectedly awakens a remnant of the Star Ruins' core, the Primordial Swordheart. This swordheart holds no killing intent, only the ultimate simplicity of the Great Dao. It can reduce myriad techniques to a single move: sweeping away leaves with a withered branch.
While other cultivators fight tooth and nail for a trace of sword intent, Mu Qingxuan sits alone beside a frigid pool to comprehend the sword, tempering his soul with clear water and refining his sword intent in the rosy glow of sunset. The young lord of the Blood Fiend Hall mocks his crude sword moves as no better than a country bumpkin chopping wood, only to have his dantian pierced in a duel to the death by a bamboo twig Mu Qingxuan casually flicks away. As the cultivation world erupts in uproar, Mu Qingxuan treads the shattered star tracks and heads straight for the heart of the Star Ruins. There sleeps the Evil-Slaying Sword Spirit, capable of severing karma, and sealed within it is the karma of his previous life, when he held dominion over reincarnation.
As the stars shift and time turns, the youth takes up a blunt, heavy sword and breaks through the nine layers of Heaven's gates. While the gods and demons of the myriad worlds pursue intricate techniques, he remains alone in the Azure Firmament Sword Mound, washing the marks from his blade with clear water as he says with a smile, "Three thousand sword paths cannot rival a single clear thought in the heart." Before the Blood Fiend Hall's treasured Ten Thousand Gu Heart-Eating Formation, the sword he swings cuts through not only the overwhelming demonic aura, but also all living beings' greed for shortcuts. When the ultimate truth of the Star Ruins is finally revealed, people are astonished to discover that this "blunt swordsman" carries within his sword intent the source of the three thousand Great Daos.