The Sins of Silvervale

Publisher's blurb: The gleaming metropolis of Silvervale has activated a device kept deep within their crypts in response to potential invasion. Now, a massive shimmering dome of energy encases the city and the seige is at a standstill. What brought this conflict, and what might be done to end the stalemate? In the mix is bizarre extra-planar artifact, new magic items, a new monster, and enough puzzles and traps to fill an entire evening with interesting adventure. User summary: For 1st - 10th level characters.