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Chapter 9: Playing the Game / General Rules / Damage / Step 1: Roll the Damage Dice and Apply Modifiers, Bonuses, and Penalties

Persistent Damage

Source Core Rulebook pg. 451 2.0
Persistent damage is a condition that causes damage to recur beyond the original effect. Unlike with normal damage, when you are subject to persistent damage, you don’t take it right away. Instead, you take the specified damage at the end of your turns, after which you attempt a DC 15 flat check to see if you recover from the persistent damage. See the Conditions Appendix on pages 618–623 for the complete rules regarding the persistent damage condition.