Slay Demons to Steal Their Lifespans: My Martial Arts Evolve Without Limit

[Slaying demons and monsters] + [No female lead] + [Decisive and ruthless] + [Evolving martial arts] + [Power fantasy] Demons and monsters run rampant, and human lives are worth no more than grass. Chen Yan wakes up one day as the lowest-ranking menial in the Demon Suppression Office's demon-processing quarters in Heishi County. After offending his supervisor, he is thrown into a pit to feed demons, becoming food for the monsters. Fortunately, Chen Yan awakens the Myriad Demon Life Prison. Slay demons and monsters to seize their lifespans and derive new martial arts techniques; plunder their demonic essence to increase his cultivation. The bloodline talents of powerful monsters can also be fused into martial arts, allowing them to evolve without end. From the Bone-Splitting Blade, which can only strip flesh from corpses, to the Ninefold Armor-Breaking Blade, with nine layers of hidden force capable of shattering armor and breaking through protective energy. From the most ordinary Ironhide Art to the Myriad Tribulations Indestructible Body, which endures countless calamities without ever being destroyed. The Fanged Demon Hound, the Crimson-Furred Monkey King, the Bone Demon General, the City-Swallowing Demon King... One monster after another falls beneath his blade. One ordinary martial art after another transforms, infused with demonic lifespans, into divine arts that subdue the world. Demons devour people and cultivate with their flesh and blood. Chen Yan slays demons and monsters, proving his Dao with their lives. Years later, the Myriad Demon Celestial Palace looms over the mortal realm, and billions of demons cross the frontier. Chen Yan stands atop the city wall with his blade in hand as the Myriad Demon Life Prison roars open behind him.