Kapitel 1961: Peace And Prosperity.

The war only got more intense when the location of World Killer was found. All four realms were engulfed by the flames of war. Even world gods in the void universe got angry with each other and fought.

9 Crowns' three heroes also had to fight each other for the godhood of 9 Crowns. It was the opportunity they needed to become gods, so they discarded their friendship and fought each other to the death. 

This fight affected Earth too. So 9 Crowns left and caused death and destruction with their absence. Everyone had to pay with blood and sweat to take advantage of their absence.