Legendary TTRPG designer Monte Cook, creator of Return to the Temple of Elemental Evil, Ptolus, and more, returns to the megadungeon!

Take your Old Gods of Appalachia Roleplaying Game adventures to deeper, creepier, and more atmospheric places with three new supplements plus useful and immersive extras. And if you're new to the game, this is a great place to start!

Journey through the depths of Ostoya in this massive 5th Edition Adventure spanning six premium hardcover books!