"However, one day, an evil force from the Otherworld invaded here, bringing endless darkness and death. To protect this land, a powerful cultivator stood up and engaged in a fierce battle with that evil force."
"In the end, that cultivator sacrificed himself to seal the evil force in the deepest part of the Extremely Yin Land. Yet, even so, the force continued to erode the land, gradually turning it into how it is today."
"And that seal reaches its weakest point every thousand years, coinciding with the Netherworld Beast King's most ferocious period. But this time, the sudden departure of the Netherworld Beast King made me realize there might be a new force attempting to break the seal."
At this point, the old man's expression became unusually serious: "My task is to hope you can venture into the depths of the Extremely Yin Land, find the location of the seal, and verify if a new force is indeed trying to break it."