Harry Potter: A Certain Ancient Rune Professor of Hogwarts (TL) - Chapter 700

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

Yang Tian, a Legendary Beast Tamer who tamed Legendary Monsters such as the Six-Wing Purple Gold Lion, the Undead Lich, and the Thousand Feet Ghost Vine has returned to three days before the Post-Apocalyptic Era begins.

“You need my help, Tesoro. You choose. A marriage with me or be torn apart by them” His voice was cool as though this wasn't a matter of life or death.I didn't want this life. My father had gambled a lot and left me with a lot of enemies and now I needed the help of Don Vincenzo LaRosa who was my high school bully and now the Don of the most powerful mafia family in Italy if I was going to survive it.It was just a marriage of convenience but I realized something. He wasn't helping me out of a good heart. I had been sold without my permission to him. I was the mafia's pawn.

Coming to the multi-dimensional Marvel world, shuttles countless movies, anime, and television planes, based on Marvel arms giant Ambrella.

Predatory Terminator, Mechanical Octopus, Mechanical Enemy, Galaxy Fleet, Pacific Rim, Transformers’ high-tech technology to build a mechanical empire, devour and merge, Superbody, New Iron Warrior, Endless, Super Out of Control, Underworld, Naruto The power, genes and technology of tomorrow’s fringe …. established a steel empire belonging to the gods of science and technology, becoming the strongest arms dealer in Marvel history.

PS: In the real world, Marvel movies are the main line, with comics as the auxiliary. The protagonist takes science and technology as the main body and magic as the auxiliary.

- Description from Uukanshu