This will start the objective: "Bring Elmus a bottle of Ashfire Mead from Thirsk."
Travel to the Thirsk Mead Hall. Several Rieklings live here but they are not hostile. Ashfire Mead can be located near a few mead barrels within the hall. Pick a bottle up and travel back to Bujold's Retreat.
Upon receiving the mead to Elmus, he will excitedly say "Oh, that's the stuff all right. You're a good friend to Thirsk, and to me. I thank you." and rewards the Dragonborn with a leveled amount of gold.
- Completing Retaking Thirsk will fail this quest if it is active.