The Mogu and the Trogg

The Mogu and the Trogg is a book found at several locations, including the northeast corner of the lower level of the Scrollkeeper's Sanctum, Temple of the Jade Serpent, Jade Forest, and at the feet of  in the Seat of Knowledge, above the entrance to Mogu'shan Palace in the Vale of Eternal Blossoms. It contains the origin story of the grummles and a parable that is somewhat based on their role in the overthrow of the mogu.