In ancient China, Taotie was a monster that preyed on humans, and it would come to human territory to look for food every sixty years. General Lin Mei led a female army and was in charge of air strikes. They took advantage of women's unique agility, and used flying shuttles to gather gluttons like birds preying on prey. They even built the Great Wall to resist gluttons, but because gluttons hadn't appeared for many years, all officers had never seen real gluttons. The European mercenary William and his companion Perot came to China to steal the formula of gunpowder and were imprisoned in the Great Wall for a long time. At this time, the Taotie came, and William saw the ferocity of the Taotie, the bravery and elite of the soldiers, and the many traps of the Great Wall. Moved by the sacrifice and trust of the soldiers, William decided to join them in protecting mankind against this unimaginably powerful force. Originally, the leader of the Taotie had been captured and the mission was completed, but the emperor ordered him to be crushed into the capital. Finally, the Taotie broke into the capital, and finally Merlin and William killed the Beastmaster together