The Villain Reborn as Game's Final Boss - Chapter 29: Researchers?

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

After a tear in reality pulls Kagari Shuya into a white room he discovers a futuristic interface for reincarnating in a different world. After looking through the different races and skills he unlocks a new race, Lucivault, a type of vampire with none of its characteristic weaknesses. All set to start his life in a new world, Shuya is confused to discover that he is enveloped in darkness. As it turns out something went wrong when he was transported and instead of appearing where he was supposed to, he appeared in an underground cave. Shuya faces untold dangers, runs for his life, before finding his way out of the underground world. After escaping he meets his Shishou and begins to learn to fight with a spear. There is also a cute black cat named Rollo.

“My turn, draw cards”

“It’s better to use this one if you’re fighting”

Looking at the card in his hand, Yue Si gave a villainous smile.

- Description from novelbuddy

Penance is a prison of eternal damnation for those who go against the will of the gods.Growing up in the slums of District Nine, Nacht was like every other individual his age, struggling to survive with what little he had and blaming the capital for it. But unlike everyone else, he had been lucky. He still had a mother who cared for him deeply and did everything she could to help him succeed. However, that all changed when his mother was offered up as a sacrifice to the capital to help bolster the number of Enlightened in their arsenal.The Enlightened were elite warriors who wielded supernatural powers and served their respected clan at the cost of sacrificing an individual for the opportunity to enter Penance and be bestowed or awakening a rune, the source of their profound power.Having been exposed to the worst of humanity due to the horrific execution of his mother, Nacht developed a relentless ambition to change the world—even if it was in his own unconventional way.After performing a disgraceful ritual, Nacht is sent into Penance, where he becomes one of the Enlightened and is bestowed a mysterious power along with an insidious punishment.