Porphyria (Heme Synthesis)
Vampires are not magic; they are victims of a rare genetic blood disorder called Porphyria. It causes severe photosensitivity (sunlight burns the skin), receding gums (making teeth look like fangs), and garlic exacerbates the symptoms. Drinking animal blood was a medieval folk remedy for the severe anemia it caused.
BIOLOGICAL ROOT
Genetic Mutation
PRIMARY SYMPTOM
Severe Photosensitivity
BEHAVIORAL ALTERATION
Nocturnal Lifestyle