Contested score

Contested scores measure your ability to avoid, withstand or shrug off harmful or dangerous effects. These can be curses, afflictions, traps, damage, weather or conditions. You always add two ability score modifier bonuses to each contested score.

Scores are calculated when rolled like ability checks, but are always called for when affected by something, never when causing an effect. It is calculated as such:

Contest result = d20 roll + 1st ability score modifier + 2nd ability score modifier + other bonuses + penalties

Contested Score	Combined Ability Score Modifiers	Summary
Reflex	Dexterity Perception	Your physical reaction time and how quickly and gracefully you can avoid physical effects.
Fortitude	Strength Constitution	Your physical ability to withstand and shrug off effects and afflictions of the body.
Sanity	Intelligence Constitution	Your mental ability to withstand and shrug off effects and afflictions of the body.
Will	Wisdom Charisma	Your mental reaction time and how quickly and gracefully you can avoid mental effects.