Rules Index | GM Screen | Player's Guide

Chapter 6: Equipment / Weapons

Critical Hits

Source Player Core pg. 275
When you make a Strike with a weapon or unarmed attack and succeed with a natural 20 (the number on the die is 20), or if the result of your attack exceeds the target’s AC by 10, you achieve a critical success (also known as a critical hit). If you critically succeed at a Strike (page 418), your attack deals double damage.