Reincarnated as the Baron's son: My Infinite Card Upgrade System - Chapter 24: Cave snake in the hole!

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

Kael Veyne was betrayed, hunted, and left for dead in the depths of the Abyssal Dungeon.As an infamous assassin, he was the empire’s deadliest shadow—until the day his guild turned on him.Ambushed in the Abyssal Dungeon, his body was torn apart, and his soul was consumed by the abyss. But death was not the end.He reincarnates 25,000 years later with the Devouring Bloodline System. Kael awakens in the body of a noble scion sharing a similar name to him, and his very essence fused with eldritch power.With every kill, he absorbs primal energy, evolving into something far beyond human. Monsters, mages, mancers, knights, assassins—nothing is beyond his reach.

A 20 year old young chef, Kai, loved Supernatural things. He loved to read and know about myths and stories and longed for them.

One day, after closing a restaurant, a voice called out inside his head.

[Help me!]

What he didn’t know was his life would change when he met a girl, a Phoenix, who asked for his help. From her, he found out about his special constitution of being able to make a contract with Mythical Beasts.

With the power of Mythical Beasts in his hand, he would shake the hidden Supernatural World.

Accompany his journey, from being a simple cook to the Mythical Slayer accompanied by a few Mythical Beasts (Girls)!

A hundred-year-old ghost who had been haunting the world had become the real daughter of the Stephens family who had some mental problems.As soon as she returned to her family from the village, her fiancé immediately came to break off the engagement and chose her cousin instead.Even his cousin who was adopted to be her parents’ son had also mocked her, “I’m sorry that I have taken your place. In the Stephens family, anyone that cannot contribute will be discarded.”Just when all the other rich families were waiting for the jokes that she would make, those who were perceptive realized that she had changed.She had risen from the bottom of her class to become the top student.Anything she said would become real. Even great scientists, merchants, and martial artists chose to become her follower.Leaders of all the fields: If she’s garbage, then I’m less than garbage. Have you ever seen anyone as good as her ending up as garbage? The Si family must be blind!While she was afraid of being alone, the CEO that loved her introduced her as he stood next to her, “This is my one true love.”