MTL - Quick Transmigration: The Villain Is Delicate and Soft - Chapter 78

Oh Kang-Woo suddenly fell into Hell one day. The only things he had were his desire to live and the Authority of Predation. He devoured hundreds of thousands of demons from the First Hell all the way to the Ninth Hell, and even made the seven princes of Hell bow down to him.

“Why are you trying to go back? You already have everything that you could possibly desire here in Hell.”

“I have everything? Like what?”

There was nothing to eat or enjoy! The only things in Hell were desolate lands and hideous demons!

“I’m going back.”

He finally goes back to Earth after ten grueling millennia.

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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

In a world where martial artists reign supreme, strength is everything. Unfortunately, that logic doesn't apply to a certain Florida Man.

Refined in the nuclear fallout wasteland, Leo was the strongest mutant alive. He carried an alien artifact, allowing him to exchange his lifespan for modern items. After 50,000 years of solitary life in a humanless world, he collected enough lifespan to transmigrate to another habitable world.

Leo was later thrown into a mysterious planet. He soon discovered that his body produced radiation, and it mutated the surrounding plants and grasses. Worrying that he might ruin the beautiful planet, he chose to live in seclusion.

Unfortunately, the local population soon discovered his existence, and a misunderstanding ensued.

He was on his way to buy some beer to celebrate his acceptance as a civil servant when he was suddenly isekai’d by truck-kun.