Before entering the arena, considering that it was a space located underground, based on Malin's previous firsthand experiences in the Underground City there, this place should also be from the world before the Great Destruction Era, possibly a location like an underground commercial center. However, hearing that it was actually a huge open space half-buried underground, Malin felt it might be a construction site still under development.
After all, the previous Underground City had a surface structure, didn't it.
Just as Malin had predicted, upon exiting the vehicle, Malin saw a massive egg-shaped structure with a metal lid on top that was definitely added later, for it showed some signs of rust. The entrance of this underground arena resembled that of a subway's main entrance, with metal walls serving as protection that had remained intact and clean, neat stairs to this day.
