Are there any rules for Vampires?

I know vampires aren't real but, is there any kind of action the vampires themselves have decided to be forbidden? Like showing or telling a human they are a vampire. I don't know much about the original vampires so please be patient with me. I already asked this question but everybody answered that they... show more I know vampires aren't real but, is there any kind of action the vampires themselves have decided to be forbidden? Like showing or telling a human they are a vampire. I don't know much about the original vampires so please be patient with me. I already asked this question but everybody answered that they aren't real. I'm not stupid, I know they don't exist. But IF THEY WERE are there any rules they'd need to follow?
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