Seven Rings of Stonehammer

Publisher's blurb: Dwarves keeps and clans are powerful fortresses guarded by steel and stone… Until one day, they are fall prey to strange dangers, foul magic, or feuding among its people. And yet the fall of Stonehammer remains a mystery. What drove the Stonehammer clan into obscurity? Are the rumors of a flooded treasure cavern true? What lurks in the darkness below?