Concept: "As the world grows dark with Nechrubel’s influence... they farm the mushrooms, listen to the messages they give them, and wait." 
Content: A slick cavern complex full of apostates, visions, monsters, and spores.
Writing: Encounter structure that builds toward the insidious influence of the fungi and the waters on the cultists.
Art/design: Illustrations highlight a traditional text. Variety in typeface throughout. The contrast in type color creates visual breaks between room descriptions. 
Usability: Background, Map, Encounter, and NPC sections blocked. Adventure is best referenced in print.