Concept: “Tales of an ancient demon prince. Demonic tunes from his flute make the earth tremble and crack open, revealing terrors previously unseen.”
Content: Copious lore, a table of guises Bergharuth takes, and stats for Suffocating Tentacles
Writing: A sinister tone and visceral, violent imagery; also includes some nascent adventure seeds
Art/design: Repetition of organic forms and lines help create a visual unity and graphically represent the concepts described in the text
Usability: Could be implemented as a background plot or counternarrative to the primary apocalyptic scenario

Concept: “Beleaguering the remnants, lingering in the reeking hallucinogenic fumes, are beasts risen from the trails of the maggot-like horde.”
Content: Elaborates on the setup, provides stats for the beasts and mechanics for the fumes
Writing: Heavily suffused with esoteric and unsavory imagery
Art/design: Adds some visual character without obstructing comprehension or use
Usability: Fairly straightforward, but the beasts and fumes together are a double threat

“Fallacious heralds and protectors of the sham god” 

Concept: “A passageway and a helmet”
Content: A location with 5 random encounters (one of which involves a helmet)
Writing: Details the different encounters and the effects of donning the helm
Art/design: Layout is intentionally haphazard and off kilter but not at the detriment of usability; lots of dead animals
Usability: If it looks like a duck and quacks like a duck, it’ll probably try to murder you