Sacrifice Across the Heavens

In the wild world, monsters roam freely, and humans are just a weak group. After the era of several strong men, they can just protect themselves. There are waves of monsters in the mountains, barbarians in the south, and various powerful groups further away. The backwardness of civilization and low technology. Let's see how a human on Earth becomes stronger step by step after sacrificing a demon and sending him to this barbaric land.