Forgotten Magic — Meg Hendry

Dana is trying to forget what happened with Ravitia. She's sent to live with her father's old master in Chert, who sends her to help the town knights. It soon becomes clear a priest of Vytorius is on the loose in Chert. The God of Fear knows about Dana's regrets and wants to use them against her. He's gathering power to return to Eavris, and it's up to Dana and the knights to stop him. Forgotten Magic is a short story.