The Undead King of the Palace of Darkness (WN) - Chapter 120.1: , The Mirage King (7)

This is a story about the protagonist getting the system, going crazy in the biochemical apocalypse, producing aircraft and tanks, destroying zombies, saving good people and killing bad people.

- Description from novelbuddy

[Adapted into Manhwa]In a world teetering on the brink of annihilation at the hands of the primordial evil, Erebos, five heroes rose to challenge fate. [The Brave] Arion. [The Divine Blacksmith] Dweno. [The Nebula’s Progenitor] Luna. [The King of Wisdom] Lisinas. And finally, me, [The Hero of Beginnings] Kyle.After my reincarnation, I found myself hailed as a great hero. “Except for one small detail, nobody mentions me.”At the Hero Academy, where the sacred gift bestowed by the gods, the Hero Record, chronicles the deeds of legends, I enrolled to uncover the truth behind my forgotten legacy.“Fine, then. I’ll just go there and become the top student. No big deal.”

[WSA 2024 Entry]

Matt saved humanity, but humanity betrayed him and murdered him and his wife, which led him to reincarnate in a Vampire World.

He quickly realized that he had been reincarnated in a unique body that, among vampires, would make him look like a genius. In addition, he has several powerful abilities that no other vampire has.

This time, he will cling to this new life to become as strong as possible to search for his wife in a world of magic and vampires.

In addition, he will try to walk the path to become a True Vampire, a Vampire Progenitor!

At the same time, his desire for revenge burns within him...

Transmigrating to the disciples of the Demon Sect, and relying on the skill modifier to become a giant of the Demon Dao.

[Detected the technique “Blood Nerve”, relying on devouring blood to practice]

[Side effects: easily affected by the spirit contained in the blood, becoming bloodthirsty, bloodthirsty, mad, and even brain dead]

[Please wait a moment, the system is being modified…]

[Ding! The modification is complete, and the side effects are cancelled]

- Description from novelbuddy