Body Refinement ------> Low-class Devil
Essence Absorption ------> Middle-class Devil
Meridian Formation ------> High-class Devil
Spirit Condensation ------> Ultimate-class Devil
Foundation Establishment ------> Satan-class Devil [low and intermediate rank]
Essence Liquefication ------> Satan-class Devil [high and peak rank
Core Formation ------> Super Devil [low and intermediate rank]
Spirit Core Formation ------> Super Devil [high and peak rank]
Mortal accession ------> Ex Class[Dragon gods]