Many generations ago, before the capitals of the states were built, the world was in total chaos. Monsters could be found everywhere, and they were a lot bigger and powerful than the current ones that could be found in dungeons. Those beasts could easily level any settlements and camps that humans could build in a matter of seconds. Around the time, most humans lived traveling around, and they only created bases when weather conditions forced them to stop. When the snow started to pile up, or when storms approached, for whatever reason, the weather was a lot worse than it is today.
"The weather, huh…" Billy thought. "I wonder if it was due to the presence of those powerful beats that walked around like they owned the world."