I saw floating 60s/70s car and a floppy disk, What the hell is that futuristic looking nation? It's like straight out of a retro future comic.
It's the Holy Mirishial Empire, the top superpower in the Central World.
Their military power is based on magitech and reverse-engineered examples from the Ancient Sorcerous Empire. Their magic is advanced but their scientific understanding is lagging behind, which is what is keeping them from being able to take full advantage of the magitech they have, and it also means they can't mass produce the best examples of Ancient magitech weapons.
If I remember correctly, they had examples of Ancient Sorcerous fighter jets that would have placed them in the mid- to late-Cold War tech level, but because they don't understand the science behind the metallurgy or of supersonic design and engineering principles, the performance of their standard fighters are just at the level between WW1 and WW2.
Far superior to anyone else, even Mu who has just barely reached WW1 tech (and is still mostly in Russo-Japanese War tech levels), but if anyone comes by with a WW2 tech level then the Mirishialans are going to have a bad day.