After Protecting the Human Race for a Thousand Years, I Became the Way of Heaven

There are humans, elves, orcs, and dwarves scattered around the world. There are four major demon clans in the central Shiwan Mountain. In order to fight for the world, the evil god imposes a corruption curse on the world every 100 years. Youshuang comes with the guardian system, complete the guardian mission and get rewards "I am invincible in the world. I will kill every one of these things."