In the Tianwu world, hierarchy is determined by bone tempering. After Mo Yan was thrown into the bone-corroding mine, he discovered that the incomplete martial veins could swallow thousands of poisons. Disguising himself as a docile mining slave, he sneaked into his enemy's Jiuyou Palace and met Ling Zhan, a medicine girl who also had a blood feud. The two used the Poison Tempering Ceremony to sneak into the core layer, only to discover that the mastermind behind the massacre of all races was actually the 'Tiandao Monument' that maintained the laws of martial arts. When Mo Yan inserted his arm into the eye of the monument, what flowed out was not light but black blood. In order to break the shackles of martial arts, he swallowed ninety-nine fatal poisonous poisons to trigger heavenly punishment. Ling Zhan burned his poisonous veins to cut off the fallen chains of the source of martial arts for him. When Wanli Xuankong Mountain collapsed, poisonous rain filled the sky, but it awakened the sleeping bones of millions of people.
