Arcadia was, funnily enough, not named as such due to some profound reason. Instead, it was a spin on the simple word "arcade."
This was how Hidden Death Valley's geniuses viewed the northern sector of the land. It was an arcade filled with various training games they could use to grow stronger, and of course, they needed to use points to do so.
But Arcadia wasn't just a place to train, it was also a place where one could test the results of their training. Aside from the various facilities that the area presented, the most popular attraction it held was the battle arena.
The battle arena was separated into four brackets: Pawn, Knight, King, and Emperor. Each of these brackets had its own Overlord that held the longest winning streak, a winning streak that was undefeated regardless of which Overlord one was paying attention to.