Darkest Rock

Concept: “A brutal delve into... Vile Geyser, a living cave that they can, if they work hard enough, befriend as a massive walking Caver familiar.”
Content: An adventure, spells, equipment, monsters, and class features designed for literal giant cave monster campaigns.
Writing: An eclectic weird fantasy style drizzled in gratuitously gelatinous glaze.
Art/design: Heavyweight line illustrations and maps accent a flexible traditional layout.
Usability: Can be supplemented with the system-neutral Caver and Cube rules.