Dice mechanics
Criticals & fumbles in Call of Cthulhu 7th Edition
How critical results usually work.
Explanation
In Call of Cthulhu 7e, critical success is rolling exactly 01 on the percentile. Beyond that, success levels (Regular at or under skill, Hard at half, Extreme at one-fifth) determine effect. Fumble is 96–100 if skill < 50, only 100 if skill ≥ 50.
Examples
Example: make crits change the scene
A critical should add a concrete benefit: extra effect, better position, reduced future risk, or a new option.
Example: messy win (V5-style)
If your system has volatile outcomes, treat 'big success' as success + consequence.
Common mistakes (smallest fix)
- Mistake: Treating criticals as just 'more damage'. Fix: Make criticals change position, options, or future risk, not just numbers.
- Mistake: Inconsistent critical rules. Fix: Write down one house interpretation and apply it consistently.
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?