Meng Qi Shi Shen < TESTED ✓ >
Start with Chapter 0 (Prologue: The Butcher of Dawn). The first five chapters are misleadingly lighthearted. By Chapter 6, the tone shifts dramatically when Lu Yan cooks a god's liver in front of a temple full of worshippers.
In this medieval world, witches exist but are persecuted by the church, burned as demonic beings. Roland soon discovers that witches possess unique magical abilities. Instead of fearing them, he uses his engineering knowledge to combine their powers with industrial principles.