(General)
Your mastery of shadow allows you to defend against shadow magic used against you.
Prerequisites
Disguise self racial spell-like ability or shadow illusion shadowdancer prestige class feature.
Benefit
You gain a +2 bonus on saving throws against spells and spell-like abilities with the shadow descriptor or spells and spell-like abilities of the illusion (shadow) subschool. If you succeed at a saving throw against an illusion (shadow) spell that deals a percentage of its damage or effect against creatures that successfully save against it, reduce the amount of damage it deals to you by 20% (to a minimum of 0%).