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The Antediluvians


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Something is lurking in the black blizzards of the Great Plains...

August 1st, 1935, northeastern South Dakota: the Great Depression and the severe droughts and dust storms of the Dust Bowl ravage middle American farmland. The town of Tillings is the site of a massive, federally funded construction: the Tillings Hydroelectric Dam. Once complete, the dam will provide much-needed irrigation to neighboring farms, flooding 300 acres of nearly deserted land.


The Antediluvians is a Call of Cthulhu 7th edition one-shot scenario designed for 4 to 6 players and the Keeper that can be played in 3 to 4 hours. The scenario includes all the assets needed to play, including NPCs and stats, maps, handouts, and six pre-generated investigators. Players may choose to use the pre-generated investigators, create their own, or use existing investigators.

Content Warning: The Antediluvians includes religious iconography, body horror, and scenes of extreme violence.

This scenario was produced as part of the Summer 2022 "Write Your First Adventure" program from the Storytelling Collective.

A lonely church on a hill

A dust storm approaches

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December 28th, 2022
Before I start, we really enjoyed the story and the setting. Great world building. It was fun and interesting to play. The scenario would be 4-stars, but the pregenerated characters were so unsuitable for the adventure that it really made it dif [...]
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File Last Updated:
August 13, 2022
This title was added to our catalog on July 31, 2022.