Birkreach Underforest - an adventure for Cairn

The roots of the birches dig horizontally across the topsoil and plunge down, weaving themselves past and through dense clods of rocky subsoil. At a depth of three yards, you begin to find pockets of damp air no bigger than a fist. At a depth of four to five yards, there are passages as large and wide as those in any castle, though they curve and meander. The floor is tamped hard as stone by hundreds of years of footfalls. Dim lanterns are tended by tiny lantern keepers, although these servants ...