The environment of the [Old World] was terrible.
It was filled with broken particles.
Perhaps, six hundred years ago, before humans arrived at the Five Continents... this place might have been a tranquil land, but now, due to the erosion of the "Black Hole," the landscape of the world beyond the giant wall was reduced to a collapsing vortex.
The flowing clouds on the horizon continuously caved in.
Here, what the naked eye saw was not real.
Because each "Black Hole" had its own Extraordinary Traits, and those traits had no pattern, many phenomena were deceptive, and one wrong step could mean death... The main mission of the Investigation Corps over the years was to map out as complete a map of the world beyond the giant wall as possible.
A twelve-person team, following the formation they practiced, "slowly" progressed on the wasteland of the [Old World].
