The Cultists Lair

From the introduction: A long thin tunnel stretches out before you. The walls and floor are made from large stone bricks. Ther[e] is light and heat coming from the end of the tunnel, along with the smell of burning sulfar [sic]. In the warm orange light the walls seem riddled with small carvings and cracks. User summary: For 4th - 6th level characters. The scenario is distributed with a high resolution PNG "playmat" (map).