MTL - Peerless Demonic Lord - Chapter 28 massacre

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!
With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

- Description from Novelupdates

Alex is a young man who struggles to make a living in the world's biggest game (Ancient world). He works as a mercenary who does every job he can find. It's been five years since his suffering started.

Ancient World creation was only possible by the World's greatest invention, “AI ZERO.”

Ancient World A vast planet Multiple times the size of Earth Ruled by Great empires, Big organizations, and hidden Shadowy associations.

A Fantasy world filled with prehistoric animals that have gone extinct on Earth. The creatures humans have only heard of in fairy tales and old stories, Monsters beyond the imagination of humans, roam the vast lands of the “Ancient World.”

Everything was going well, but it all changed on that day.

When the United States told the World “AI ZERO.” and “Ancient World.” technology was a gift from a very advanced intergalactic civilization. That has surpassed humanity in any way of life by an uncountable margin.

Humanity entered a new era, and the Ancient World became humankind's most important part of life.

Alex joined the game to make a living and support his family, but things didn't go as he had hoped.

After suffering in the Ancient world, Alex returned five years back in time.

Alex knows that the Ancient World is not just a VR game.

Now with a new chance in life, Alex will get strong and reach the top while finding the truth about the Ancient World.

“I don’t care what Thanos’ ideals are, and I don’t care what the consequences of having too many creatures in this universe will do, as long as he doesn’t ruin my business with that damn Infinity Glove!” – Kahn Ponte

Once he traveled to the world of American comics, Kahn had the golden finger to trade all worlds.

At this point, the name of Boss Kahn not only resounded in the Americas of the Marvel Universe, but his influence spread to all the worlds!

PS: There are many follow-up worlds such as Marvel, Naruto, Harry Potter, One Punch Man, Black Robe Pickets, Dragon Ball, Pirates, etc. You can decide…

- Description from novelbuddy

A genius talisman practitioner is reborn as a seven-year-old girl! However, her innocent appearance belies her vicious personality.