Sword Cuts Natural Selection

After Emperor Xuanyuan unified the nine realms, he became an immortal and went away. Only one descendant, Xuanyuan Tianze, is left. After the ruthless thunder tribulation, Xuanyuan Tianzai disappeared from the Nine Realms. In the battle between Feng Yu and the Immortal Kings in the ancient world, his elemental power exploded. The world counted down for two thousand years, and his life or death was uncertain... 16-Year-old Yu Nianchen suffers from a lot of evil and can only live until the age of 20... Let's see how "they" defeat natural selection with one sword! Kill all the nine realms and kill all living creatures! Put your destiny in the palm of your hand!