The battle at the beginning obviously had no agreement that prevented attacks on the injured.
Humanity and the Heretic Forces were completely engaged in a war of survival, intent on each other's utter destruction, so this place was severely attacked as well.
In the air, occasional old and blurry images and sounds flashed by.
Unfortunately, due to the lack of clarity in sounds and such, there wasn't much of value to be found.
"However, it's worth mentioning that the monsters trapped in the 'Time Reversal' on this floor are basically gone, and most are just historical images..."
"Those trapped mostly congregate from the minus first to the minus third floor, and moreover, they are all of intermediate strength... This seems pretty normal as the more powerful ones can usually detect traps and wouldn't easily enter."
"It's just unclear who the 'Demons' fear from 'them' specifically."