The lair of the vampires, since it's referred to as such, this place is not a castle where vampires would dwell in some works; it's simply a den.
Vampires in this world also don't dress in noble attire, holding red wine in their hands, with pale faces and elegant demeanor. The vampires of this world are monsters, hideous in appearance, with sharp fangs—a bite from one wouldn't leave just two holes but would take out a chunk of flesh.
The clothes they wear are not elegant noble costumes but ragged, torn rags. Vampires hardly look human and can use some spells to affect the human mind, but don't expect to acquire any proper clothing through such means. Occasionally, some of their clothes are still ripped from their victims.