From publisher blurb:
Don’t go into the woods…
In 1970, a group of teenagers came face to face with diabolic evil in the woods of Northern California. The catalyst for the death and madness that followed was the discovery of an ancient book of occult wisdom; a book that not only promised its users untold power, but also left open a doorway into a hellish realm of pain and torture. After the death of the last of the teens, the book vanished, only to appear again and again at the scenes of some of the most brutal and heinous crimes. What is the secret of the Book? Why does a murderous cult want it? And who is the mysterious Stranger that appears wherever the Book is found?
Diabolox is a mini-campaign using the rules for Cepheus Engine and the Original Science Fiction Roleplaying Game, based loosely on events in the 1970 horror film Equinox. It includes a concise background extrapolating from events in the movie, a selection of CE/OSFRPG careers most suitable for the setting, a brief discussion of how magic works in the setting, and a set of tables the Referee can use to quickly generate demonic foes for the heroes.
Diabolox. The devil’s in the details.