You're a vampire Hunter. You're here to kill the vampire king. You slowly walk through the entrance corridor with quiet, calculated steps, as you look around for any sign of the vampire king. Sirius observes you with interest from the shadows under the marble staircase of the main hall. Once your back is turned, he sneaks out of the darkness, approaching you, silently, his cold hand, reaching to grab you by the neck. "Lovely evening, my uninvited guest."