( Disclaimer: These information chapters may contain minor spoilers, so if you cannot handle a little bit of spoiler info, refrain from reading them. You'll find out about them in the book anyway )
Supreme four(The most influential countries in the world):
Audaznimo
Feuer
Wakimi
Sadila
These kingdoms were known as the supreme four because they were the only kingdoms with huge boundaries, great military forces, and powerful rulers, the kingdoms were surrounded by high walls, and not only that, they were protected by what was known as the ultimate defense.
Four blue crystals known as the defense crystals. Just as the name suggested, the crystals kept the kingdoms safe from external attacks and if anybody would try to sneak inside and do something crazy that person would be risking his or her life as the crystals would automatically become offensive as soon as an attack from the inside was launched eliminating the creator of the attack and everybody involved in it so apart from being defensive, the crystals could also be offensive in the inside only.
These crystals were put on four pillars stationed in every corner of the kingdom, to enable them to sync and create the defense. Once a crystal is taken out, the defense wouldn't be as impenetrable as to stop a full-fledged attack, but once they're linked together, they're unstoppable.
The supreme four were the only ones who had this and they all had it stationed in similar ways with the pillars.
These kingdoms were quite far from each other but the distance between Audaznimo and Feuer wasn't that far as they were both found in the same continent.
Audaznimo was located in Eastern Europe while Feuer was located close to North Central Europe.
On the other hand, Wakimi was located in Africa while Salida was located in North America.
There were a lot of other small kingdoms scattered across the globe, but they were insignificant compared to the supreme four and a lot of them bore grudges against the supreme four especially the ones in their respective continents.