SRD:Armor of Darkness

The spell envelops the warded creature in a shroud of shadows. The shroud can, if the caster desires, conceal the wearer’s features. In any case, it grants the recipient a +3 deflection bonus to Armor Class plus an additional +1 for every four caster levels (maximum bonus +8). The subject can see through the armor as if it did not exist and is also afforded darkvision with a range of 60 feet. Finally, the subject gains a +2 bonus on saving throws against any holy, good, or light spells or effects. Undead creatures that are subjects of armor of darkness also gain +4 turn resistance.