Nordic Daggers can be improved with a quicksilver ingot at a grindstone. They benefit from the Advanced Armors Perk, which doubles the improvement.
Unenchanted Nordic Daggers will begin to appear at level 25, and enchanted versions can be found at level 26.
- One can be found next to the body of Bjornolfr, behind the secret passage in Hrodulf's House. This is a fixed location and will spawn regardless of the Dragonborn's level.