League of Legends: League of Unknowns - Chapter 30 - Are You Blaming Me?

The end of the world is coming, the world has undergone great changes, and everything has changed. Plants, animals, and even insects, as long as there are living things, have mutated.
Become more powerful, and even evolved supernatural abilities, such as chickens and ducks that can fly to the sky, such as cats and dogs that can breathe fire.
But only humans, without any obvious changes, seem to have fallen from the top of the food chain to the bottom of the food chain overnight.
Any creature that can open its mouth to eat can treat humans as food.
But fortunately, this world has not completely killed humans. Gradually, humans discovered that they had the ability to cultivate compatibility with other creatures.
As long as it has a high degree of compatibility with some powerful mutant creatures, it can be used for its own use to achieve the purpose of protecting itself.
Fang He is a person who is very compatible with mutant animals, but it is also because of his ability that he has changed from the strongest to the stupidest.
Fang He, who was reborn, said, “Hmph, this time…”

- Description from novelbuddy

After coming out of a tunnel… it was pitch dark.

My name is Lin Fan. I have crossed the border. I want to cultivate immortality, and my mana is boundless.

The Immortal Dao is ethereal, and Immortals are hard to find.

Li Nianfan had descended into the cultivation world as a mortal. After learning that he has no hope in cultivation, he only wants to live a peaceful life.

However…

The dog he adopts becomes a demon king of a generation when it sees his poems and paintings. It manages to suppress an entire world.

The tree he plants behind his house becomes a World Tree after listening to his zither music, forming a bridge between heaven and earth.

He meets a passerby who is enlightened by him and becomes an immortal sage who leads an entire generation.

When he looks back—

It turns out that the scholar who had been pestering him for his calligraphy and paintings despite having crappy chess skills, is a chess saint from the Immortal Realm. The beautiful woman who comes to listen to his music every night is the number one saintess of the Immortal Realm…