The faerie Morgana

"To the other priestesses of the Nine, a powerful council at the Lady's Temple, Morgana is haughty and arrogant as she performs feats of magic no human should be capable of. Rumors start that she must be a fearsome fae. To King Arthur, Morgana is a trusted and devoted advisor, but his court is wary of her and her prodigious talent at divination. But his wife sees Morgana as a rival and a malevolent witch. To Braithe, Morgana's faithful acolyte, she is simply the most powerful priestess Camelot has seen. Morgana doesn't know why she's so different from everyone else, and she doesn't much care. But when she aids Arthur to ascend the throne before his time, she sets off a series of events that will change everything Morgana believes about her power"--