Demon Lord:

The sky and the earth are dark and yellow, and the universe is primitive. Since the end of the ancient war between gods and demons, the Three Realms have established the four realms of immortals, humans, demons, and demons. They have been clearly distinguished and have maintained a truce for thousands of years. Legend has it that deep in the void rift at the junction of the four realms, there is an ancient secret realm called the Ancient Realm of Ten Thousand Demons. It is the residence of the first generation of Demon Lords and the source of demonic energy in the world. The secret realm is full of unknown dangers, ancient restrictions, lost inheritances, and seals several ancient mythical and vicious beasts, as well as the power of chaos that is enough to subvert the order of the three realms. The ancient gods spent endless cultivation, united with the four great spiritual masters, the eight great immortal sects, and the supreme demon clan. They used the spiritual veins of heaven and earth as the lock and the essence and blood of the divine beasts as the seal to completely seal the ancient realm of ten thousand demons. They established the ancestral motto: No living thing in the three realms will ever set foot in the secret realm. As time goes by, three thousand years have passed by in a blink of an eye. The world of cultivating immortals in the human world was at its peak, with major sects spreading out and having thousands of disciples. However, the years of ease gradually wore away the awe of the cultivators. The world of immortal cultivation is divided into three camps: seven righteous sects, three evil sects, and hidden cultivators. The righteous sect is headed by the Lingxiao Immortal Sect, which strictly abides by the rules of heaven, kills demons, and protects the common people; the evil sect takes the Blood Soul Palace as its lord, is murderous and aggressive, covets ancient power, and has no bottom line in its actions; and the secluded monks who wander between good and evil are solitary and hold many ancient secrets, becoming the most mysterious group of people in the three worlds. The originally stable seal of heaven and earth has been quietly loosened by the accumulated spiritual energy turmoil, monks' fighting skills, and changes in the earth. The monstrous demonic energy deep in the ancient realm of ten thousand demons slowly leaked out along the cracks. At first, it was just the appearance of monsters in remote mountain villages and the monks going crazy. It gradually evolved into the spiritual veins drying up in many places.