This crunchy 5E sourcebook elevates your adventure to new heights with flying mounts for all characters and their adversaries! Variant cover by 2014-era legend Hydro74 is hobby trade exclusive! Plus exclusive play mat, pogs and pawns for tabletop play!

A mega-dungeon that supports a full-year campaign. A legendary adventure considered by many to be one of the greatest of all time! Explore a thousand-year-old dungeon mystery waiting to be solved...