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Dice mechanics

Modifiers in Call of Cthulhu 7th Edition

Bonuses, penalties, and situational adjustments.

Explanation

CoC difficulty often changes the success threshold (Regular/Hard/Extreme). Use that lever before stacking many small modifiers.

Examples
Example: position over +1/-1

Instead of tiny modifiers, change position: better cover, better tools, better information.

Example: keep it consistent

Pick one primary difficulty lever for your table (DV/DC, threshold bands, required successes) and stick to it.

Common mistakes (smallest fix)
  • Mistake: Stacking many small modifiers. Fix: Use one clear difficulty lever and keep the decision readable.
  • Mistake: Applying modifiers without stakes. Fix: Define what success changes and what failure costs before rolling.
More dice mistakes

Call of Cthulhu 7th Edition FAQ

How does the percentile system work in Call of Cthulhu?
How does the skill improvement system work?
What are the Characteristics in Call of Cthulhu 7e?
How does Sanity work in Call of Cthulhu?
What are Occupations in Call of Cthulhu?

Keep play fast

Use quick references, then jump back into the scene.