Secret of the Past

About ten thousand years ago, the world effect of this world was not so complete, and an unknown low-level demon accidentally came to this world through a Gate of the Abyss.

Such a new world was born every day in the Infinite Worlds, so discovering a new world was actually nothing much.

But as more and more demons intruded into this world, this place began to become chaotic.

There were many worlds with Purgatory Spaces, but it was quite rare for one to have such a large Purgatory Space. After many demons entered this place, they treated it as a new territory, established lairs to live here, and fought one another over territory and hunting grounds, making this place chaotic.

The frequent travel of the demons between the Abyss and the Purgatory Space here quickly attracted the attention of the angels, so they began to descend to this world to continue the Eternal War with the demons.