Nidome no Yuusha - Chapter 1/Prologue: The Hero swore revenge

Luo Zheng is at the bottom of the Luo Clan hierarchy, despite his family being the founders of a power refining technique that could instantly defeat any opponent.

One night, enraged by unfair treatment from a family steward, Luo Zheng burns the family records. In doing so, the hidden magic in the book engulfs him and Luo Zheng becomes a new skilled fighter. Fleeing his home and despicable clan, Luo Zheng must learn to harness his powers to rescue his younger sister while his own cousins are on his pursuit.

- Description from Novelupdates

Instead of struggling meaninglessly, he acknowledged his place.

The boy named Ulysses has longed for the respected profession of priest since he was a child, and has been working hard for this ideal. However, by chance, he became the heir to the Demon King chosen by the “Book of Curses”. After experiencing many setbacks and blows, he is still working hard, trying hard, trying to return to the path of priesthood.

However, there are many powerful enemies in front of him.

Always getting lost, the heroic fiancee of Ulysses is single-minded, Rasha; guarding the “Book of Curses”, the little devil Aya who will do anything to turn him into a demon king; very worried and worried about his own children, the extreme north. Earth’s Ice Phoenix mother; Helen, the strongest weapon girl who can destroy the world for her father.

A witch with very bad magic but excellent swordsmanship, a saint with divine power, a dragon who burns like a flame, a Hydra who loves to mate and love everyone together… Today there are also many brave warriors who are ready to crusade against the Demon King.

In front of these lovely and enthusiastic warriors, can he really become a pure-hearted priest as he wishes?

(In this story of love and justice, the girls who can “tear down” the demon king are all brave)

- Description from novelbuddy

Carlos Valois thought dying once was enough—until he woke up as a 10-year-old in the world of “The Dark Era,” a game he'd mastered in his previous life.Born as the last heir of a fallen noble house, Carlos discovers he's destined for a tragic fate: in six years, he'll be manipulated into joining the dark forces and killed by his own childhood friend. But this time, he has the ultimate cheat code—memories of the future.While other kids play with toys, Carlos hunts for divine legacies. Using his game knowledge, he performs an ancient ritual and steals a Demigod Mark from the thousand-year Sacred Oak—a power that should have remained hidden for decades.At 15, Carlos awakens as a Death Herald with broken stats that shouldn't be possible. Most Death Heralds are fragile summoners hiding behind weak skeletons. But Carlos combines his necromancy with stolen divine abilities, creating a hybrid build that turns him into an unstoppable force......[Skeleton Warrior has successfully evolved into Purple Thornblade Skeleton Guard!][Purple Thornblade Skeleton Guard has activated Bond: Glory of the Purple Thornblades!][Twelve Purple Thornblade Guards have formed an Undead Armored Knight Legion!].....His skeleton warriors aren't cannon fodder—they're elite undead legions enhanced beyond normal limits through secret evolution paths that took thousands of players years to discover.Every “coincidental” encounter is actually Carlos farming legendary opportunities. While his sister thinks he's just a lucky genius, Carlos systematically raids every hidden treasure, secret technique, and forgotten legacy he remembers from the game. Ancient bloodlines, divine artifacts, mystical cultivation methods—if it exists, he's taking it.With his infinitely evolving undead legion, Carlos set out on a path to rewrite destiny and become the supreme Death Herald legend.