In this adventure, your PCs (levels 6-8) are introduced into the deepest dungeon realm of them all - the Hollow World! What begins as a simple rescue mission turns into an epic quest at the earth's core; they'll discover magnificent lost civilizations, jungles filled with extinct (?) dinosaurs, and learn the dread secrets of the Labyrinths of Chitlacan... a great way to expand a campaign that's lost its flair.