Skyforge Steel Dagger

The skyforge steel dager may be obtained after finishing the companions quest up to when they say you can get a skyforge weapons. If the dagger is not an option you may buy it from Eorlund. Another way to get this is if you finish enough companion quests you can ask them to follow you, ask aela the huntress to follow you then ask to trade items with her. The dagger should be in her inventory