Information about world level.

Low to high

F, E, D, C, B, A, S

Low level world = F to E

Normal modern. Ancient times. Fluff. supernatural. Worlds

Middle level world = D to B

Supernatural. Game. Apocalypse. Worlds

High level world = A to S

Futuristic. Fantasy. Privative. Worlds

Some depends on the world. Like a ancient world with war as the main subject or a peaceful privative world with less fighting but more growing. So this is just here for the level system.