text: This person once poisons a mantle richly decorated with precious stones, but the gift is not delivered since its bearer is burnt to coals.
full_question: This person once poisons a mantle richly decorated with precious stones, but the gift is not delivered since its bearer is burnt to coals. In another story, this person makes a replica of an object that protects its bearer from dying from blood loss, giving the real one to Sir Accalon of Gaul. This person is described peddling healing ointments at the wedding of Erec and Enide by Chretien de Troyes, who calls her a "chief physician." This unhappy wife of Urien gives her name to a (*) mirage seen off the coast of Sicily. She unsuccessfully competes for the affection of Lancelot with Guinevere. Along with Morgause, this woman is a daughter of Igraine and Gorlois, making her a half sister to Arthur. For 10 points, name this wicked sorceress in Arthurian myth.
first_sentence: This person once poisons a mantle richly decorated with precious stones, but the gift is not delivered since its bearer is burnt to coals.
raw_answer: Morgan le Fey [or Morgane; or Morgaine; or Fata Morgana] 