An official OSE supplement of demons, cults, and dark magic.

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

A fantasy adventure tabletop RPG, inspired by D&D 5e classes and monsters, but built with modern, narrative rules that strive for fluid gameplay, creative freedom, and a cinematic feel.