Under a Velvet Cloak

Nox, the Incarnation of Night and Mistress of Secrets...
It is the year 500 AD. Kerena, a beautiful young girl living near King Arthur's Camelot, is apprenticed to Morely the Seer. Morely teaches her fantastic magic, but when he mysteriously disappears, Kerena finds herself out on the street and must resort to prostitution to survive.
Kerena prospers as a skilled courtesan until she is taken into service by Morgan le Fey, the sorceress sister of King Arthur. Kerena's knowledge of magic grows as she is required to carry out nefarious deeds for the evil Lady Fey.