Sledgehammer

 
Weight: 100.0
Value: 400
Artifacts Skill to Identify: 24
Requires: Strength 50, Mace & Flail 1
Quest: Destinae Dominus, find Marten
Ascension; Spoiler
 
Found: On the beach (#4) Sea Caves
 
Used: To break the wall at (#11) Sea Caves
  
Not really a task that needs to be performed as there are other ways to leave the area near Marten's Tomb.