Ancient Tome of Shadows The book is found in the ancient library on the 2nd map of the Pillar of Ravenloft adventure. The book tells a mythical poem about unleashing the creatures of the Underdark or transporting them to the Shadow Gate. It all depends on how the reader is able to determine the clues in order to place the crystals in the proper order. More information is found in the Pillar of Ravenloft Guide.