This is just explaining a few things before i continue with the story. So here goes...
When creating potions healers can not make the potions work unless they use power points(explaines later what power points are). Each potion depending on the severity or use of the potion has different amount of power point to use. The amount used can also depend on how rare the items are or what type of potion it is.
Potion colors have different meanings
Green-healing
Red-poison
Orange-telakanisis
Brown-woodland
Blue-water
Pink-fire
Only wizards or masterful dragons can create potions. Halfbreeds can not neither can messangers
Power points is an energy that humans emit from the body to create power potions etc.
There are 4 kingdoms hence the tietle. North, south, east, and west.
North kingdom, the wizarding kingdom;
King- All Might or toshinori
Prince- Izuku Midoriya
Main royal gaurd- Uraraka
Healer- Prince Izuku
Largest of all the kingdoms. Even has a forest filled with ancient tribes and ruins behind the actual kingdom
South kingdom, The land of dragons;
King/queen- Mitsuki Bakugou
Prince- Katsuki (is successor since mom died while growing up)
Main royal gaurd/dragon- Kirishima
Healer-Recovery girl
Second largest land has a beach behind the kingdom
East kingdom, land of halfbreeds;
King- Endeavor
Prince-todoroki
Main royal gaurd-tokoyami
Healer-Shouji
Not the smallest kingsom but not the biggest either. Is outcasted since it is a breed of two.
West kingdom, Messanger kingdom
King- Enginium
Prince- kings brother tenya iida
Main royal gaurd- momo
Healer-koda
That should do it hope that clears up some stuff