MTL - God Level Demon - Chapter 2870 Furnace wizard

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

A 29 year old civil employment exam student wakes up in a blank white room and meets a baby angel. This baby angel informs him that he died in his sleep due to heart disease like his father and grandfather. Remembering his mom and their last conversation he says that he will take on a series of life and death tests that the baby angel offers him. From this point on he must put his life on the line and fight in the stage called ‘Arena’. And Every time he clears a test he will gain abilities and weapons to increase his strength. All to clear the tests and get his life back. This is his story of his fights in the ‘Arena’.

Meet Sora and Shiro, a brother and sister who are loser shut-ins by normal standards. But these siblings don’t play by the rules of the “crappy game” that is average society. In the world of gaming, this genius pair reigns supreme, their invincible avatar so famous that it’s the stuff of urban legend. So when a young boy calling himself God summons the siblings to a fantastic alternate world where war is forbidden and all conflicts–even those involving national borders–are decided by the outcome of games, Sora and Shiro have pretty much hit the jackpot. But they soon learn that in this world, humanity, cornered and outnumbered by other species, survives within the confines of one city. Will Sora and Shiro, two failures at life, turn out to be the saviors of mankind? Let the games begin…

“You nearly killed me in the past timeline and destroyed my life. Now that I have been given the chance to return to the past timeline, I will be changing everything and fight the future that was meant to be a dead end. Once we meet again, it will never be the same!”

When the only Virtual Reality game called Alternate World made the players gain abilities, the world changed drastically. The whole world undergoes a change of lifestyle, people started to manifest abilities, and playing the game became a job.

Manato Tsukasa, a player who is also one of the players of Alternate World was targeted by his enemies during the evening before his wedding and was almost killed in the process. Due to a certain encounter, he was allowed to gain a second chance to go back to the past and change everything.

With the chance to change everything and start from scratch, he decided to take advantage of all his knowledge and so that he can prepare to kill the person who ruined his life. And to start his vengeance against his enemy, he played the game again that didn't only change the gaming industry but also the whole world.