The mutated evil spirit's power spread throughout the Kawa Great Forest like a plague virus, and all the Beastman Tribes and even the living creatures caught up in it turned into living corpses, completely reduced to puppet slaves.
At the same time, wherever the living corpses swept through, the land also became contaminated and spread, turning into a rotten wasteland.
Large expanses of forest meadows vanished, and the surviving vegetation seemed to have been cursed in the most dreadful way, becoming hideous and twisted, as if haunted by ghosts trapped within. At nightfall, it became a dead land of the underworld upon their arrival.
By the time the major Beastman Tribes reacted, the unknown mutated evil spirit had already grown to a significant scale.
Conflicts naturally ensued. To suppress the evil spirit's expansion, several major Beastman Tribes united for multiple purges, but the result was constant defeat. The fallen comrades on the battlefield quickly became enemies.