Douluo Dalu: The Legend of Heavenly Ruler - Chapter 18: A Spar?

Xiao Yu, who was a student from modern Earth, accidentally transports to another world and becomes the lord of a territory. Facing an unfavorable situation, he vows to take back his family business, build his new territory, kill all of those who covet his wealth, and dominate the world!

- Description from Novelupdates

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

(Main World: Marvel)

(Current simulation order: Demon Slayer → One Piece → Bleach → Naruto → Fate → Elden Ring → Overlord → To be determined)

Rebirth

He can simulate life in any other world and gain power from it.

Before each simulation starts, there is a high probability of drawing rare talents!

…

Color talent: [World Creator]: You can change the rules of this world at will, you are immortal and the creator of the world!

Golden Talent: [Fader]: Immortal and immortal, the unblessed who was abandoned by death and immortality at the same time, the destined king!

Red talent: [Destined to draw]: When you play cards or draw a lottery, you will definitely get what you want!

Purple Talent: [I am the Empress]: You are destined to become the empress of this world, with dreadful talents, unparalleled strength, and more powerful and loyal subordinates, who will expand your territory and compete in the world for you!

…

A god-level talent is dazzling.

More importantly, these talents can be brought into the real world, and even abilities can be extracted!

“What kind of superhero is this!”

“Enjoy the beauty of another world, isn’t it fragrant!”

- Description from novelbuddy

When a glowing portal yanks Leo from his struggling existence, he is saved by a mysterious system which gifts him new chance to break free from his side character experienceRebuilding an abandoned guild to honor his family’s legacy, Leo finds himself under the evil eyes of monsters, both from humanity and the gates he ventures intoin short : overpowered necromancer building a guild.