This will be updated as the story moves forward.

Item Rankings:

Common

Uncommon

Rare

Red Silver

Purple Diamond

??? {Hasn't been revealed yet}

Skill Level Rankings:

Beginner

Intermediate

Expert

Master

Grandmaster

Rankings Levels: (From least to greatest)

F

E

D

C

B

A

S

SS

SSS

F being the easiest and SSS being the most challenging.

F giving out the least rewards and SSS giving out the most rewards.