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Archives of Nethys

Archives of Nethys

Pathfinder RPG (1st Edition) Pathfinder RPG (2nd Edition) Starfinder RPG Starfinder RPG (2nd Edition)

Rules Index | GM Screen | Player's Guide
Player Core / Chapter 8: Playing the Game / Immunity, Weakness, and Resistance

Weakness

Source Player Core pg. 408 Spring 2026, 1st Printing
If you have a weakness to a certain type of damage, that type of damage is extra effective against you. Whenever you would take that type of damage, increase the amount of damage by the value of the weakness. For instance, if you are dealt 2d6 fire damage and have weakness 5 to fire, you take 2d6+5 fire damage.

A single effect can activate more than one weakness at a time, but adds each of the subject's weaknesses only once. For example, if you made a Strike with a flaming cold iron battle axe benefiting from a spell that gives it additional fire damage, and you targeted a creature with weakness to cold iron, fire, and slashing, the Strike would benefit from all three weaknesses but wouldn't apply the fire weakness twice.

Some weaknesses can apply when a creature wouldn't normally take damage, as determined by the GM. In such cases, you take damage equal to the weakness value when touched or affected by something with that characteristic. For example, a creature with weakness to water would take extra damage if it were targeted by a spell with the water trait or splashed with water.