The Gilded Gauntlet Quest Guide in The Blood of Dawnwalker

You trigger the Gilded Gauntlet Side Quest when you visit Maragir village after fully angering Ambrus in The Blood of Dawnwalker. Coen finds the villagers gathering around a corpse Ambrus has displayed for the public. A servant will explain that Ambrus is going to keep killing people until Coen agrees to duel with Ambrus. She reveals her name later and admits that her master, Iulian Cordin, sent her to inform Coen that he wishes to speak with him.