Fax in Tenebris is zine-sized tabletop RPG about knights, horror, and faith. The players are a band of holy crusaders descending into an accursed crypt seeking a lost artifact of great import. Along the way, they must face challenges both physical and spiritual; while the crypt itself is dangerous, the real threat is within the crusaders themselves.

Fax in Tenebris is meant for short-form play, with full games lasting only a session or two at most. The zine contains everything needed for play: rules and procedures, the crusaders themselves, the challenges and questions of the crypt, and the possible end-states of the game.