Monster

Monster LVL 1 to 3

F monster depending in title and soul or race.

Even a level 4 is an A rank like a bill.

Monster LVL 4 to 5

D rank.

Monster LVL 6 to 7

C rank.

Monster to lvl 8 to 9

B.

Monster to level 9 to 11

A rank.

S rank monster level 10 to 25.

SS rank monster level 25 to 50 .

Some of these monsters are dragon.

SSS rank monster 50 to 75 .

Demigod rank monster level 75+

Almost cannot be killed .

D rank adventurer at least level 4 .

C rank adventures at least level 6.

B rank adventurer at least level 10.

A rank adventurer at least level 15 .

S rank adventurer level 30 .

Hero level 60 .

Legend level 80 .

Unknown level 100.