Bring a Daedra's Heart to Moth

Walkthrough
While in Understone Keep, the Dragonborn can speak with Moth gro-Bagol, the resident blacksmith. During this conversation, Moth mentions that he is making a special weapon for the Jarl and requires blood from a Daedra Heart to complete it. The Dragonborn can then offer to get one for him.

Bring a Daedra's Heart to Moth
If the Dragonborn does not already have Blood-Kin status with the Orcs, successfully completing this quest will achieve that. Additionally, bringing Moth the heart then raises his opinion of the Dragonborn and the Orc becomes a marriage candidate.

Bringe ein Daedra-Herz zu Moth