Unlock the Keening Blade Legendary weapon by completing the Unbound quest by collecting the four journals in the following locations:
1. Adventurer's corpse in Ruined Temple on the "Urn Of Sacred Ashes" quest in the southwest corridor. 2. Brecilian Ruins' Lower Ruins in the south fire trap room. 3. Talk to an adventurer in Orzammar's Tapster's tavern. 4. Go to the dirty back alley in Denerim, and fight the demon.