During the Shangyuan Dynasty, humans, demons, demons and immortals coexisted in the four realms. In addition, Fendu controlled the order of the four realms. In the early days of the first year of the founding of Fendu, an evil dragon appeared to disturb the order of the four realms. Later, the twelve sword-holding elders sealed it. The evil dragon fell and started a new journey with the human world.
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