The Author is an Extra, The MC is a Reincarnator - Chapter 3 Mana Breathing Method

Traveling through the troubled times, the strong are born, and the dangers are everywhere.

Lu Wangchuan found that as long as he consumed a certain amount of energy and blood, he could directly improve the level of his skills.

Consume 1,000 calories of energy and blood, and complete the Cracking Mountain Fist to open the monument and crack the stone.

Consume 10,000 calories of energy and blood, and cut the river with one sword at the full level of Wuji Swordsmanship.

Consume 100,000 calories of energy and blood, and destroy 100,000 enemies instantly with the ultimate Prajna Dragon Elephant!

…

Time flies, when the energy and blood exceeds a trillion trillion, Lu Wangchuan suppresses the sky with one thought, and destroys the gods with one word!

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- Description from novelbuddy

Levi, a young man who spent over a thousand years in a cultivation world, awakens in a hospital only to discover that two years have passed on Earth. The world he left behind has completely changed—mysterious spiritual energy has appeared, transforming Earth into a cultivation world filled with monsters, undead cultivators, and mysterious places like floating islands.Though Levi is furious that the entity who transported him to the other world failed to stop time on Earth as promised, he must now face the new reality. In a world now filled with cultivators, interdimensional conflicts, and the presence of a cultivation leveling system, Levi struggles to adjust to his weakened human body while seeking to uncover what happened to his mysteriously missing family.

Zhen Zhen was reborn in the forest area in the 1960s with a drop of the blood of the ancient gods. The awakening of the blood of the gods not only gave Zhen Zhen one power after another, but also made her the most favored little lucky star in the family!

- Description from Novelupdates

The moment when mercenary leader Kwang Hwi receives video game like abilities, the world is suddenly thrown into chaos. A thick fog envelops the Earth, bringing with it savage, otherworldly monsters. At the same time humanity has been rendered defenseless against this onslaught, as the strange fog turns most weapons to rust. With mankind spiraling towards oblivion, it is up to Kwang Hwi, with his new abilities, to save the world. Watch as Kwang Hwi leads his militia and becomes the last bastion of humanity. Will he be this world’s savior, or its conqueror?