The Ruined City was located behind the elite Hero Academy, stretching over 4 kilometers. In the past, this city used to be populated with citizens and all the various establishments were functioning well. One could even say it was a first-rate city, but this city met its unfortunate fate after the emergence of the beast.
The beast first appeared in the Antarctic desert, later classified as part of the lost lands, before slowly advancing into the city inhabited by humans. This city was one of the first to be invaded by the beast. Despite the Heroes' timely arrival, there was bloodshed and a lot of casualties, and in the end, the heroes had no choice but to evacuate the city.
Roughly a year later, the Elite Hero Academy was established at the outskirts of this city. Knowing that the city would be valuable, the then and present principal had included the city in the Crystal-powered Dome that could turn invisible and constantly change its location.