Three hundred years ago, the human alliance under the leadership of Emperor Xuanyuan fought a decisive battle against the demons who had ravaged the world for thousands of years on the shore of Weishui.

With the help of Ying Long, the human alliance was completely victorious, and the head of the demon king Xingtian was cut off by Emperor Xuanyuan and hung at the pass of Buzhou Mountain.

The remaining demons were forced to move to the bitter cold Netherworld in the far north after signing a contract with humans, and the first mountain system in the north was the dividing line between humans and demons, which was also called the Demon Domain from then on.

After the war, all human warriors, under the leadership of Emperor Xuanyuan, cut their middle fingers and swore a blood oath in the direction of Buzhou Mountain: If the demons set foot in the human world again, all human warriors must unconditionally assemble and resist the demons with all their might.

This is the so-called sacred oath.

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