After the emergence various types of dungeons have appeared in Arcadia.
And after a long time they have been classified into various types, depending on what kind of threat they possess, what kind of opportunities and qualities they hold, or changes they'll bring to the surrounding area once they're cleared. Will they remain open and hidden, like a separate secret realm, or will they completely merge and become a part of Arcadia etc etc and etc.
There are literally so many things and so much to explain and experience when it comes to dungeons, towers, and outer worlds. That it could take up entire arcs.
So we'll delve on that some other time. For now let me tell you about one of the most important things Arcadians have found in the last few centuries. -Meru Dungeons.