the unusual abilities displayed by Sebastian St. Cyr are characteristic of Bithil Syndrome, a little-known but very real genetic mutation found in certain families of Welsh descent. Bithil Syndrome is marked by astonishingly acute eyesight and hearing, and an abnormal sensitivity to light that allows those with this genetic variation to see clearly in the dark. Other characteristics of the syndrome include extraordinarily quick reflexes, a misshapen vertebra in the lower back, and yellow eyes, the eye color being recessive to both blue and brown.
