After Marrying a Vegetative Princess, I Went Crazy With Joy! - Chapter 71:

Roy’s life was nothing special. The only thing commendable was the last few moments when he saved a mother and her child from a drunk driver.
…
It’s really an egg! Damn it, what kind of monster have I become? Did I fall into Hell instead of making it to Heaven??
Join Roy as he ventures through various worlds with the Custom Made Demon King System—a system that allows Roy to draw anything he can imagine and create it through exchanging souls!

In this world, orphans or just anyone without any hope for this world can apply to become a “walking target”. Their sole purpose is to be a practicing dummy for the students of the sect who train to become “Demon Hunters”. These students need “walking targets” to test their training on living, walking beings of flesh and blood.
In exchange, they will be provided with food & shelter.
Their existence value is lower than a slave, but if they manage to survive a few years they can receive a life long pension.

Xiao Han is such a “walking target”. One time he witnessed a powerful Demon Hunter disposing a demon. When the demon died, a fragment of the demon that managed to escape entered Xiao Han’s heart. No one saw that, and even Xiao Han himself only felt some discomfort for an instant.

But that thing in his heart soon gave Xiao Han visions, and the first one is of a cultivation method which allows Xiao Han to absorb damage to enhance his body. A perfect cultivation method for a “walking target”.

- Description from Novelupdates

In the 21st century, a female military doctor, Lu Jiao, transmigrated into a novel and became the vicious mother of four little villains and the wife of the future First Assistant.

In the novel, the four little ones would grow up into villains who committed all kinds of crimes and killed people without batting an eye. Eventually, they would end up getting killed by the male and female protagonists. To avenge his sons, the First Assistant would transform into the final boss and die after committing many sins.

Lu Jiao looked at the four little ones who were only up to her knees, then looked at the bedridden First Assistant. Forget it, she would do a good deed by educating these children properly and giving the First Assistant medical treatment while she was there.

What she didn’t expect was that the four little villains and the future First Assistant would want nothing more than to send her to her death.

They attempted to strangle her in the middle of the night, use broken pieces of porcelain to slice her arteries, and poison her food. Lu Jiao was furious. “I’m not doing this anymore. If you want to become villains, go ahead.”

However, the four little ones now refused to let her go.

“Mummy, please don’t go. We’ll be obedient from now on.”

The Great Human Civilization has crumbled apart, falling into the Abyss. A hell with no escape. To survive there, some rules must be followed blindly.1: Be wary of the dead for they don't rest even in death.2: Always be on the lookout. Danger lurks everywhere in the Abyss. Nowhere is truly safe.Lastly, if you hear something unusual like a voice that shouldn't be there, do not investigate. Just run. At least then you might get to keep your life.***Kev's adult life was suddenly upended when he was pulled into a nightmarish world along with countless other humans. To survive he had no choice but to perform a ritual he chanced upon through a series of inexplicable events. The ritual promised great power. He gave in to the temptation, performed the ritual and stepped into the realm of mysticism. At the same time, he unknowingly put himself at great risk. Since the moment he performed the ritual, He faced the risk of losing his humanity or himself entirely.He didn't know then that performing the ritual demanding a great price. By the time he realized it, it was already too late to turn back.You have performed a Great RitualGained class:- Corpse Collector in the DarkTrait unlocked: esoteric mutation of the soulGained skill: shadow manipulationAssimilation rate: 0%Collect corpses to growIncrease in assimilation rate unlocks new skillThe power comes with a great pricePay it obediently like a law abiding Abyss Dwellers or risk losing yourself to the evil brewing within...