Shadows of Brimstone - Devoured by Darkness (Encounters Game Supplement)

From Flying Frog Productions:

A deep roar shakes the spongy floor and ribbed walls of the living world, while fleshy bile pumps spurt acidic juices and chitonous Bone Mites scurry across the walls and ceiling. Within the Belly of the Beast, every aspect of the world around is trying to devour you as you pick your way through the pools of muck and fluttering flaps of the impossibly massive creature.

This 15 card OtherWorld Belly of the Beast Encounter Supplement is themed for the corrosive environment, deadly creatures, and terrifying living hazards that fill the pulsating tunnels inside the Belly of the Beast.

You need a core game Forbidden Fortress to play with this expansion.