Investigators
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Roll under. Lose your mind.
Basic Roleplaying's d100 engine, rebuilt for cosmic horror. Investigators roll percentiles to spot the clue, fire the revolver, or keep their sanity — and the dice decide which of the three they still have by dawn. Complete with a full Sanity System, Mythos creatures, 1920s equipment, and ready-to-run scripts.
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Player's HandbookVolume IHow this system plays — the rules, the dials, and the intent, straight from its author.OpenBuilder's ManualVolume IIHow to build on this system — its conventions, extension points, and design intent, for creators adopting it.OpenCompendiumReferenceEvery entry this system ships with, rendered exactly as your project will inherit them.OpenAuthor's note
This project adapts the Basic Roleplaying: Universal Game Engine for Call of Cthulhu-style play. Core pillars: skill-based percentile rolls (roll under), a structured Sanity System with disorders and recovery, curated 1920s-era weapons, armor, and gear, and Mythos creatures scaled for mortal investigators. Every rule element is a browseable card — investigators, creatures, weapons, and armor all render as sheets, and the Sanity Check, Skill Check, Combat Attack, and Character Generator scripts run the mechanics live.
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Glimpses