Mage ArmorSource PRPG Core Rulebook pg. 306 (Amazon)
School conjuration (creation) [force]; Level sorcerer/wizard 1, summoner 1, witch 1
CastingCasting Time 1 standard action
Components V, S, F (a piece of cured leather)
Target creature touched
Duration 1 hour/level (D)
Saving Throw Will negates (harmless); Spell Resistance no
DescriptionAn invisible but tangible field of force surrounds the subject of a mage armor spell, providing a +4 armor bonus to AC.
Unlike mundane armor, mage armor entails no armor check penalty, arcane spell failure chance, or speed reduction. Since mage armor is made of force, incorporeal creatures can't bypass it the way they do normal armor.
Mythic Mage ArmorSource Mythic Adventures pg. 100
The armor bonus increases to +6. There is a 50% chance that any critical hit or sneak attack made against the target is negated and treated as a normal hit, as if the target were wearing moderate fortification armor.