White Saint Demon Lord

Lin Yuan, a menial disciple of the Demon Cult, wakes up in agony to find himself crippled, his cultivation destroyed. His dantian shattered and inner energy drained, he faces death within seven days unless he finds a way to survive, destined to be thrown into the Ten Thousand Poison Pit to dissolve into blood. In this desperate situation, a system called the 'Martial Arts Deduction Engine' activates in his mind. With the incomplete 'Nine Yin Scripture' gifted by the system, Lin Yuan breaks through to the second-rate realm within three months and is assigned to an external task squad. On his first mission, he encounters the elite Zhangqiu Guard of Xia Kingdom. Captain Wu Yao kills a post-natal realm expert with a single palm strike, and Lin Yuan risks his life to save the severely injured captain Su Wan. In a fishing village by the Wusha River, he first touches the cruelty and warmth of this world. From the borders of Xia Kingdom to the black market of Jin Kingdom, from the Five Poison Sect to the Peach Blossom Spring, Lin Yuan gradually rises to prominence. He uses modern thinking to analyze ancient martial arts, employs the system's deduction power to fuse righteous and evil techniques, and creates his own 'Nine Yin Demon Art'. During the chaotic battle in Liuxiang City of Jin Kingdom, he forcibly breaks through to the first-rate realm to save Su Wan, carving a bloody path through desperation. The Demon Cult leader Zong Ge—the only grandmaster of the era, known as the Azure Cang Demon Lord—summons him to his deathbed. 'The celestial realm is not the end; it is a tribulation.' — Description from novelcodex.org