This is a fanfic so I am going to make a few things that did not exist in the original and alter somethings so you all need to be ready for that. This is going to be going lowest to highest and it is my power scale so it will not match canon, sorry.
Low class devils/ Beginner exorcists/ Two winged angels
Middle class devils/ Experienced exorcists/ Four-six winged angels
High class devils/ Veteran exorcists/ Eight winged angels
Ultimate class devils/ Special class exorcists/ Ten winged angels
Satan class devils/ Twelve winged angels/ Weak Gods
Super class devils/ Strong Gods
Ddraig/Albion
Trihexa/Great Red/Ophis
................
Magic Levels
Basic= Low Class
Beginner= Mid class/ High class
Intermediate= High class/ Ultimate Class
Advanced= Satans/ Super class/ Gods
Pinnacle= Ddraig/Albion
I know I am probably going to get a lot of crap for this but oh well.