Seven Sins System - Chapter 41: You Have to Pay me, Body or Soul

Ethan accidentally rode the wrong train and ended up in Brynhildr Magical Academy where Wizards and Witches are taught on how to use Magic.As someone who didn't have any magic powers, he thought that he would be punished for being in a place where he wasn't supposed to be. Fortunately, due to a stroke of luck, the teenage boy managed to avoid the worst case scenario, and ended up staying in the Magic Academy to learn magic.Ridiculed by many for being magically crippled, Ethan strived to adapt to his new school life with the help of his new friends, who made him realize what True Magic was all about.

I accidentally changed the whole world, the resurrection of the dead, genetic variation, recovery of the qi, mountain and seas reborn, land and seas expanded and evil spirits have started to appear.

Ghosts are now commonplace. Some people now have three heads and six arms. Some people have obtained martial arts techniques and ordinary people are now just cannon fodder.

Fortunately, I have acquired an ability which can make various items mutate.

books into martial arts or cultivation manuals,

fruits into precious treasures of heaven and earth or poison that you can only imagine and…

weapons, that can split the earth or gain sentience!

- Description from Novelupdates

A one-of-the-kind advanced game? Liberty Online.

Dungeon master class that needed to protect his dungeon core?

No system in place to revive monsters by magic, it's up to him to keep them alive.

Unfortunately, that's not all he has to worry about.

The whole population of immortal players has set their sights on his precious dungeon? And

Woah Dungeon got conquered in the game. Many celebrated, but he cries blood tears for his mistake.

Not able to handle the pressure, he died in remorse for how stupid he was his whole life.

But then something miraculous happens. He got reincarnated back in time - one year after the game’s release!

Armed with knowledge from his previous life, He will use this chance to achieve his every dream.

He strives to reach a height where no one dares to touch or even think about touching him.

This is the story of Roan - a man who will use all his power and strength to become king of Liberty Online!