Saving Throws

Generally, when a character is subject to an unusual or psionic effect, the character gets 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 the character's class, level, and an attribute score. A character's saving throw modifier is:

Base Save Bonus + Relevant Attribute Modifier + Miscellaneous Modifier

The Base Save Bonus is a saving throw modifier derived from character class and level. Base save bonuses increase at different rates for different character classes.

The DC for a save is determined by the attack itself. A natural 1 (d20 lands with 1 face up) is always a failure when rolling a saving throw and a natural 20 (d20 lands with 20 face up) is always a success.

Fortitude
These saves measure a character's ability to stand up to physical punishment or attacks against their vitality and health. The relevant attribute is Constitution.

Reflex
These saves test a character's ability to dodge area attacks. The relevant attribute is Agility.

Will
These saves reflect a character's resistance to mental influence as well as many psionic effects. The relevant attribute is Wisdom.