The baby who was abandoned in the Sword Tomb had the Fallen Immortal Artifact "Execution of Evil Sword" sealed in his body. When he awakened, he triggered the Nine Heavenly Thunder phenomenon. The protagonist Xiao Chen accidentally triggered the ban on the Sword Tomb during the Qingyun Sect trial and awakened the sleeping ancient sword spirit "Cangwu".
While exploring the Netherworld, Xiao Chen discovered that his blood could purify the demonic energy, and that the secret of the Chaos Dragon Blood was hidden in his body. In order to prevent the demon king from resurrecting, Xiao Chen joined forces with the righteous factions to enter the ancient battlefield, and used his blood essence to activate the world-destroying power of the Evil Killing Sword.
