: The story starts with a standard missing person case that turns dark.

| Entity / Character | Role | |-------------------|------| | | Human sorcerer, former environmental activist turned nihilistic cult leader. Uses Mythos to “cleanse” humanity. | | Shub-Niggurath | The ultimate threat. Her avatar appears in the final chapter as a colossal, writhing mass of tentacles, mouths, and hooves. | | The Obsidian Tablet | Artifact that controls weather patterns and earth energies. | | The Bleeding Stone | An extraterrestrial monolith that alters biology of nearby life. | | Dark Young | Lesser avatars of Shub-Niggurath appear as minibosses. |

The investigators are drawn together by anomalous weather patterns, mass animal migrations, and reports of "beast-men" spotted in rural Massachusetts. The trail leads to a seemingly abandoned brewery in Vermont, where the Brotherhood is cultivating a fungal agent that transforms humans into hybrid servitors.

As a classic product released in 1998 (SKU 2374), a direct, official PDF from Chaosium is often unavailable on their main site due to artist contract restrictions. Therefore, many players and Keepers look for second-hand physical copies or digital alternatives.

Chaosium, the publisher of Call of Cthulhu , has a robust catalog of classic material converted into digital formats.