This is The Last Rite, a short story from the Incarnate Duty anthology that takes place between books IV and V of The Legacy Incarnate. The stories in this anthology are chronological in order, but I won't say where this story falls in that timeline.
To celebrate the sharing of this story, I have created some new merch based off our hero of the story, Tarcua! Please go check it out!
Without further ado, please enjoy!