for both mana and physical stats.

level 1 F class

level 2 E class

level 3 D class

level 4 C class

level 5 B class

level 6 A class

level 7 S class

level 8 SS class ( A strong country will have less than 10 SS class beings )

level 9 SSS class ( only 2 beings alive have this level)

level 10 Demigod( stuff of the legends, no one currently known is at this level)

physical stats are overall combination of things like strength, stamina, agility and toughness.

clicking on it will give separate details about the 4 things mentioned above.