From the introduction: Below the Crumbling Stair is a long forgotten temple of Mystra, goddess of Magic. The priests that remain have all gone foul and a clan of Chitines has traveled from the deep to find a new home here. Also, recently, a pair of Desmodu bats flew in a chimney air spout, causing it to cave in, leaving them trapped inside. User summary: The PDF rendering makes the document very difficult to read.