Thousands of Years of Immortality

In the realm of the human race, good and evil have been at odds for thousands of years. The mountains and rivers are stained with blood and all life is in ruins. The demon clan outside the territory lives in the wilderness, watching the internal fighting among the human clan but rarely getting involved, forming a world of its own. It wasn't until ten thousand years of evil broke out of the abyss, killing countless people, and both the good and the evil were severely damaged. When one person suddenly appeared, he was shocked to realize that internal strife had already shaken the foundation of the human race. The former sworn enemies put aside their grievances with one person, took the help of the demon clan, and gathered the power of heaven and earth. Using their own cultivation as a guide and the mountains and rivers as the basis, they ended all hostilities and worked together to suppress the evil spirits in this world and gain peace in the human world. But what is there in this world?