In the Great Qin dynasty, demons and monsters run amok, and mortals are like blades of grass. Su Yu time-traveled, bringing with him a slaughter system that kills monsters to earn slaughter points, which can be exchanged for cultivation techniques and divine bodies, with his realm having no bottlenecks. He barged into the Ten Thousand Demons Cave alone, emerging drenched in blood three days later, with a mountain of corpses and a sea of blood behind him. Years later, extraterrestrial demons invaded, and all clans submitted. Su Yu stood at the vault of heaven with a single man and a single saber, looking down at hundreds of millions of demons, and grinned, "Today, not a single one of you is getting away." Emperor Shi sighed, "Su Yu, you are truly the greatest calamity in this world!"