The Dented Shield of Horuz Killcrow is a common archaeology artifact. It requires 35 Dwarf Archaeology Fragments to complete, but allows one keystone to be used.
The grave mistake made by Horuz when he and his companions fought the great wyrm Kaldrigos cost the storied warrior his life. He stood directly behind the dragon. Never do that.
Completing this artifact is part of the Blue Streak achievement.