Adrisal -
This is one of the older kingdoms that were made and has been led by a being from the stars named Elliot. This is one of the few kingdoms that still rely on magic. It's population however consists of a mix of both humans and non-humans and the royal family tries hard to make sure there is fairness for both sides. This kingdom relies on both trade from the seas and the mysterious ores beneath it to grow it's economy.
Mementos -
The oldest kingdom and the one that sees itself as the only kingdom that should exist. It's king is known as the Eldest King due to his immortality that he claims is a gift from the divine. The kingdom is huge spanning many lands and continues to grow as more smaller kingdoms are overpowered by it. It's wealth and fame is known throughout and it's economy is one of the best between all the others. However the secret of it's military might comes from deep beneath the castle where the being that stopped the war 50k years ago lays dormant.
Asterin -
This kingdom is closest to the rule of the stars and heavens and believes solely in divinity. The king is known as one who leads them to the heavens due to his great powers and like Adrisal is one of the few magic relying ones. This kingdom is a mixture but humans are the majority by just a bit compared to non-humans. A lot of what happens in this kingdom is unknown due to how secretive and closed off it is to other kingdoms. Mementos has attempted to try and take it over but failed due to a seemingly powerful barrier that surrounds it.
The Edge -
It's not really per say an "edge" of the world but a mystical area where nobody knows where it'll lead them too. Some that went in recklessly have never returned and for several hundreds of years nobody knew exactly what to make of it until the monsters appeared. They were horrifying beastly creatures that attacked many kingdoms that were close and made them unlivable. Those touched by the monsters were cursed with many perishing to the curse due to the effects. Otherwise the ones who were severely injured never healed completely and were scarred. The strongest rulers of the kingdoms had to come together and try and seal the portal and for now they were successful. But there's a rumor that this was a sign of a calamity. Some even referred to it as a prophecy where this time it's not just those monsters but something much scarier that will wipe out all life on this world