My Heaven-Defying Demonic Arts Scared the Demon Emperor to Tears

[System + decisive killing + dynasty + no hiding one's cultivation + slaying demons + a demonic cultivator powered by merit] Also known as: How did I, a Demon Suppression Guard, end up slaying gods? Li Chenzhou is transported to a world overrun by demons and awakens the Merit-to-Godhood System. As long as he slays demons and punishes evil, he earns merit and increases his cultivation. But all the techniques and spells the System gives him are demonic arts. As he practices, his righteous aura somehow turns into overwhelming demonic fiendish energy. Li Chenzhou doesn't dwell on it. Demonic arts are fine, as long as they work. He uses the most evil demonic arts to kill the most terrifying monsters, slay the gods above, and extend humanity's fortune by a hundred thousand years. Many years later. Demon Emperor: “That's a righteous technique? Which of us is actually the demon?” Demon Ancestor: “How can this human have more demonic energy than I do?” Empress of Great Yin: “Li Chenzhou, you are the Divine King who protects my nation, and the man at my side.” As Li Chenzhou watches a million demon soldiers and fiendish generals besiege the city, he raises a hand. Demonic might surges forth, and a single slash splits a thousand miles of demonic clouds, stunning the whole world. “I was just practicing. Is all this really necessary? Though... using demonic arts to kill demons really does work.” This blurb doesn't do the story justice. Read the novel to find out more.