Academy of Sciences of Heroesland

But someone somewhere said that this is not a Death Knight at all, but a vampire!

Morning, you don't understand anything about fantasy! I was saying that a Death Knight is none other than a Greater Vampire. Even liches are essentially vampires, as they drain life from living creatures. Practically all undead are vampiric, as they feed on the energy of the living. Even a regular skeleton is a vampire, as it feeds on the energy of a necromancer.

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And why should I change my nickname?

Your nickname clearly contains the word "wolf."

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But in real life, such an animal does not exist!

Well, why not? Create a mutant dog with three heads, raise it to enormous size, and coat it with phosphorus. Isn't that a hellish hound?