Altar:

The heaven and earth have been open for thousands of years, divided into two parts: pure and turbid, and the pattern of the six realms is stable. In the center of the ancient world, there stands an altar that connects heaven and earth, connecting the four realms of mortals, immortals, gods, and demons. This altar was not built by manpower, but was formed by the fusion and condensation of the natal divine bones and the spiritual veins of heaven and earth after the death of the creation god. It is the source of the spiritual energy of the entire six realms and the last barrier to suppress all evil in the world. When the ancient gods were alive, they used their own souls as locks and divine beasts as guards, and set iron rules: no unauthorized access to the altar, and no personal use of divine power. Anyone who is greedy and wants to use the power of the altar to dominate the six realms will be punished by heaven. As time goes by, the gods gradually retreat into the long river of time, leaving only sporadic inheritance and guardianship oaths. Thousands of years ago, the Lord of the Demon Realm, Youye Demon Lord, coveted the original power of the altar and led millions of demonic armies to invade across the realm in an attempt to break the seal of the altar, extract the divine power of creation, and subvert the order of the six realms. At that time, powerful men from the immortal world, the human world, and the demon clan joined forces to start a shocking battle under the altar. In the end, a group of ancient great masters severely damaged the Night Demon Lord at the cost of their lives and sealed his body in the depths of the Demonic Abyss. His souls scattered and escaped. At the same time, they strengthened the altar's boundaries and selected descendants with the best spiritual roots in the world to serve as guardians of the altar from generation to generation. They will be passed down from generation to generation to guard the altar forever. That war was called the "Holy War in front of the Altar" by later generations. Under the altar, the bones of countless powerful men were buried. The once prosperous secret realm outside the altar also became extremely dangerous due to the aftermath of the war. Miasma, phantom formations, residual souls, and ancient beasts were entrenched in it, and it gradually became a forbidden land that no one dared to set foot on.