Fiona is an elven mage from Orlais. Formerly a Grey Warden, she is now the Grand Enchanter of the Circle of Magi. Depending on player's choice she can become an enemy in Dragon Age: Inquisition.
If player chooses to recruit Templars, then Fiona and her fellow mages join Venatori out of desperation. She's one of the leaders during Venatori attack Haven. She faces the Inquisitor and dies in fight despite her magical skills.