MTL - After Wearing the Book, I Became the Second Mary Sue - Chapter 468 specify

Shao Xuan joins a friend in his expedition to a recently discovered archaeological cave. After he picks up an ordinary looking stone he is teleported to a different world and wakes up in the body of a small orphan child. The world he is in now is still in its stone age with primitive tools made of stone and the ways of the people are savage. Savage isn’t the only thing special about the people though, because they have superhuman strength, jump higher than trees and punch stones. In short, they are able to cultivate their bodies. Despite all this, it is a real struggle to survive because of the scarcity of food. Together with Caesar, his pet wolf, he tries to survive in this cruel world.

- Description from novelupdates

The world was once at war with 10 alternate worlds. This was known as the Concept War and our world won 60 years ago. All of this was concealed so no normal people are aware of this fact in the current time.

After the death of his grandfather, the high-school student Sayama Mikoto is suddenly summoned by the giant corporation IAI. He learns this world is headed for destruction due to the acceleration of the Minus Concepts. To prevent this, negotiations must be undertaken with the survivors of the other parallel worlds so their 10 concepts can be released.

And so Sayama is caught up in the final battle to clean up after the Concept War which left behind so much enmity.

Humanity is caught in a great upheaval after the Intergalactic Union of All Species coincidentally discovers their existence on what they had formerly considered to be the fringe of the universe.Without any say in the matter, they get indicted into the Union as a legal member. Unfortunately, this meant that they were now obligated to partake in the exploration of a new Chaotic Realm parallel to their universe containing rich energies, resources, and essence that the universe itself craved.To that end, the universe has created its own will, which seeks to gather all races and strengthen warriors from them to explore the dangerous but lucrative Chaotic Realm, initiating the Augmented Reality simulation, Essence.In Essence, one can experience a carefully crafted universe similar to an RPG game, either by going in through your soul or going in through VR. The former means that death is true, and the latter is similar to a normal FIVR experience.Those who go in with their souls can freely receive feedback from their 'game characters' to obtain all stats, skills, and items they acquire in Essence, while those who go in with VR do not obtain that benefit.However, those who pay for it in Essence can receive an awakening of genetic talent called abilities. These abilities are graded from F to EX, a total of 10 stages.Not much is expected from the human race when the first 100 participants get chosen at random from the public - a standard protocol - only for each one of them to awaken at least an A-grade ability.Then, there was Damon Arnan, a young Ghanaian politician, who ended up awakening, not one, not two, but three EX-Grade Talents.The human race, which had just entered the galactic playground, was about to experience a storm with Damon smackdab in the middle.

True evil needs no reason to exist.

“All living creatures must die, but I wont. ”

Once known as the most talented and knowledgeable scholar/philosopher across three continents, he basked in the praise and reverence of those around him. However, tragedy struck one fateful night when he bore witness to the cold-blooded murder of his entire family. Driven to madness, he embarked upon the path of power, the path of negative energy, and thus, The Great Demon, Badur, was born.

In a single day, a mountain of corpses were stacked, many of which fell to his blade. However, during his final pursuit of revenge, he met his untimely demise. His soul was extracted and cast into the void, where it would endure eternal suffering.

However, his jouney would not end here……

“What do you desire?”

A grotesque creature floating in the void asked while staring at the bruised and beaten soul of a young man.

[Ding!! Host has received Void grade Treasure]

[Ding!! Goal has been set : Attain True immortality]

A new lease at life is presented

A deal with a Demon filled with resentment

A new journey, a new Dawn

With that the great Demon, Badur is reborn

ps: the book won't progress the way other novels have been progressing. if you don't like a unique development then maybe this isn't the book for you.