Zero no Tsukaima - Volume 16 Chapter 10

I finally managed to kill the demon lord.

Hutson, a man reborn into a ruthless and dangerous world, now inhabits the body of a young hunter in a small barony. With no connections and nothing to his name, he must rely on his sharp mind and cunning to rise through a medieval-like society. As he climbs the social ladder, he uncovers a terrifying truth: wizards, beings far more powerful than any knight or noble, rule over the world. Driven by this discovery, Hutson throws himself into the pursuit of wizardry—a path darker and more brutal than he could ever have imagined. In a world where betrayal lurks around every corner, Hutson seeks what all others desire: immortality. With his intellect and ruthlessness, he will stop at nothing to claim it for himself.

In her previous life, Gu Tong was blind to people's true natures, and died unjustly, becoming the number one venomous woman scorned by all.After her rebirth, Gu Tong tore apart her cousin with her bare hands, shattered the mistress on her chest, and stewed the scum in an iron pot, becoming the first Doctor who brought aid to the world; none who owed her could escape.Her happy and perfect new life officially began, and Gu Tong shouted her loud slogan, “Kiss, hug, lift high, husband, let's have a baby, oh yeah.”

How long will it take for a murdered thief to distill into something monstrous? In this story the darkness only grows stronger, and its reach only grows wider as it expands by devouring the life that surrounds it. This is a dark fantasy where evil is a where, not just a who that focuses on slow progression, undeath, and atmospheric storytelling.