MTL - Great Tang Idyll - Chapter 16 Who is the king of the devil?

Shao Xuan joins a friend in his expedition to a recently discovered archaeological cave. After he picks up an ordinary looking stone he is teleported to a different world and wakes up in the body of a small orphan child. The world he is in now is still in its stone age with primitive tools made of stone and the ways of the people are savage. Savage isn’t the only thing special about the people though, because they have superhuman strength, jump higher than trees and punch stones. In short, they are able to cultivate their bodies. Despite all this, it is a real struggle to survive because of the scarcity of food. Together with Caesar, his pet wolf, he tries to survive in this cruel world.

- Description from novelupdates

[You have successfully devoured your target.][Your strength has increased by 250.][Your speed has increased by 200.][Your defense has increased by 300.] [You have acquired the Golden Immortal Bloodline.][You have acquired the Chaos Beast Physique.][Your cultivation has increased.][You have accumulated Madness.]The Era of Chaos is upon the Cosmos once more leading to various kinds of Chaotic Rifts spawning randomly.Meanwhile, a 26-year-old actor on Earth, Pascal Margrave, transmigrates into the body of Caelum Goldheart. Upon transmigration, he becomes the host of the World Devouring System - a system that allows Caelum to quickly become stronger by absorbing the power of anyone he kills.However, things are not so simple. Caelum quickly realizes that while he is the [Host] of the World Devouring System, he is not its true [Master]. Failing to complete the system's milestones within the designated time will lead to his soul being tortured in the Netherworld for all Eternity.Join Caelum on his journey as he attempts to take control of his own fate, uncovers the hidden plots around his transmigration and becomes the dominant power of the Cosmos.

I want an S-Rank skill too! I want it so badly, I could die for it!