SAVES
SAVES SUMMARY
Generally, when you are subject to an unusual effect or attack, you get a saving throw to avoid or reduce the effect. Like an attack roll, a saving throw is a d20 roll plus a bonus based on your class, level, and an ability score. Your saving throw gains bonus from associated attribute modifier.
Fortitude
Associated Attribute: Constitution
These saves measure your ability to stand up to physical punishment or attacks against your vitality and health, and attempt to resist poisons and diseases.
Reflex
Associated Attribute: Dexterity
These saves test your ability to dodge area attacks, for example if you are hit by explosion or force lighting, if you success on reflex save, you suffer half damage.
Will
Associated Attribute: Wisdom
These saves reflect your resistance to mental influence as well as many force/magical effects.