"So, you meant to say that every blood group will have different powers. But it can be varied due to their classes? Then there is no way to derive a proper hypothesis from this issue."
Kayden read about the class division among the vampires in the history book, the status quo had split the vampires into three classes. Class A vampire was the stronger in physical strength compared to class C vampires. Their power division precisely 'type of power' was based solely on the blood type. Supposedly the vampire possessing A positive blood group had the ability to bend wind, the ability would be absent in A negative vampire.
It appeared that something similar was going on with Beelzebelle, which Kayden was unaware off. Incubi and Succubi were nearly dead beings until they discovered the secret that they could possess blood groups by drinking blood of humans The revelation gave them the perk of increasing their strengths and to attain other kinds of hidden powers.