Dragon Master: The SSS-Ranked School Belle Asked Me To Contract Her - Chapter 19: Battle Mage

In the early world of immortal cultivation, there was no physical cultivation among immortal cultivators. And a top bodybuilder who came from the earth has opened up a new path here and became the ancestor of physical training.

- Description from novelbuddy

Kiro is a slave branded with a deadly collar, forced to work in brutal mines under the ruthless Kargal Empire. Each year, slaves are hunted for sport in the deadly Hunting Games—a fight to the death on a savage alien moon. This year, Kiro is chosen to play. Sent into a wilderness filled with monsters and traps, survival seems impossible. But something ancient watches from the shadows—and it has plans for him.