During the Guangxu period, the peace of Wuchang City was broken by a strange and ominous omen - a man-eating cave opened at the northern foot of Snake Mountain late at night, and the woodcutter disappeared mysteriously, leaving only a bloody and rusted hatchet. Chen Mo, a student at Guling Academy, saw the phosphorus fire in the cave flashing like demon eyes, and learned from ancient books that this was a bad omen for "the stone python swallowing": the mountain suppressed the thousand-year-old demon python that was transformed by Gonggong's collision with the landslide!
The snake-scale disease spreads throughout the city. The academy cook Lao Yangtou uses talisman water to save people, but secretly burns bloody clothes at the entrance of the cave. When the government dug a new Drum Tower Cave to suppress demons, the fishy fluid seeping out of the rock cracks caused the craftsman to die suddenly! Chen Mo followed Lao Yangtou and was shocked to see the soul of his son Li Dahan emerging from the cave - the young man was bound by a snake-shaped black chain and screamed "Dad, if you kill nine people, I will survive!"...
In order to break the deadlock, Chen Mo took the Yellow Crane Tower bronze darts and Qingchuan Pavilion turtle shells deep into the demon cave. On the night of the blood sacrifice, he broke the rune stones of the snake niche, fell into the Dayu channel at the bottom of the abyss, and found the broken dragon chain. But the ground has become a hell on earth: the demonic python borrowed the blood of boys and girls to form half of its body, and ghosts are rampant in Wuchang City! When the Buddha's light in Guiyuan Temple collapsed, Chen Mo climbed to the top of the Yellow Crane Tower and used his mortal body to attract the Nine Heavens Divine Thunder——
When the Turtle and Snake Mountains transformed into the Xuanwu God King and nailed the demon marrow into the heart of the river, Chen Mo wrote on the stele, "The demon is not in the mountains, but greedy and delusional in people's hearts." Three years later, when he took a boat to take the exam, green scales grew on his sleeves like poisonous buds. The remnants of demonic marrow at the bottom of the river float down the current to the East China Sea, and the sound of the iron ropes of the new Drum Tower Cave is still echoing on the rainy night...
