The power rankings in this novel are quite simple
There ranks are:
Alpha
Beta
Gamma
Alpha being the highest and Gamma the lowest,
But there is one more called the omega or God rank.
NB:Exclusively for Gods
And in each rank there are for levels:
E,D,C(Gamma)
B,A(Beta)
S,SS,SSS(Alpha)
LOW,HIGH,ANCESTRAL(Omega)
Same power system applies to weapons to an extent(they use the ranks but not the levels)
Other explanations will be seen in the novel.