Later, for some unknown reason, the Oyon Civilization suddenly vanished from the world. Black Rain Villa, a war artifact, was left behind, hidden away in a corner of the World of Calamities, naturally evolving over time.
In this uncontrolled and savage process, some adverse influences emerged and gradually took root. Until, at some point later, Black Rain Villa was discovered by an Extreme Fist who then reactivated it.
This Extreme Fist was the owner of the broken sculpture that Casio had seen earlier.
The manor owner was an Extreme Fist, and also a scholar who advocated research. He was passionate about exploring the Oyon Civilization and had discovered Black Rain Villa through traces and clues. After restarting the villa, the Extreme Fist began further experiments to validate his own ideas. He was committed to finding a definitive solution to the calamities, and applied various methods to Black Rain Villa.
