This expansion builds specifically on the Forbidden Fortress Core Set, adding new cards and map tiles for the Fortress and Belly of the Beast worlds. It also adds new missions to play, 4 new playable Heroes (the Enforcer, Geisha, Soldier, and mythical Kitsune), as well as 4 new enemy types to battle (6 Takobake Spearmen, 3 Skin Crawlers, 12 Chochinobake Lanterns, and 1 XL Fallen Shogun boss).