F ranked - Useless
D ranked - Chores can be done
C ranked - Affects strength, albeit not by much
B ranked - Can help increase strength or gives magic/psychic powers
A ranked - Some unique powers, most give large boosts to power
S ranked - Famous powers, most are unique
SS ranked- Super rare, most holders are famous. All are unique
SSS ranked - Only 3 exist. They are world leaders and two have their own sect/clan. Their powers are completely unique, not even similar to any other existing powers.