When a creature is the subject of a dangerous spell or effect, it often receives a saving throw to mitigate the damage or result.
Saving throws are passive, meaning that a character does not need to take an action to make a saving throw—they are made automatically.
There are three types of saving throws:
Fortitude, used to resist poisons, diseases, and other bodily ailments.
Reflex, used to avoid effects that target an entire area, such as fireball.
Will, used to resist mental attacks and spells.