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The Auras I felt were strangely similar to the Vampire Powers of Rose or Camilla, were they Vampires then?! But why were they down- Ah, I think I can guess what's going on.
My senses never fail me, I think these are Camilla's "backup plan" as she told me beforehand… I don't know if they're NPC or Players, but maybe these Vampires are like her servants, or friends, and are here to protect the castle.
I never thought she would have a whole second organization aside from her Guild, which is one of the strongest Guilds in the entire Server… She's sure filled with secrets.
Not only living a double life as the Queen of a Human Kingdom, having a child with an inhabitant of this world, being the Guild Master of the strongest guild while pretending to be a man in there, all while she is probably some sort of Underworld Vampire Queen with a large following of bloodthirsty servants…
Check "The Protagnist's Sister Is Actually the Strongest"!