Epic Mage Armor

School: Conjuration (Creation) [Force]
Components: V,S
Range: Touch
Target: Creature touched
Duration: 1 Hour/ Caster level
Saving Throw: None (harmless)
Spell Resistance: No (harmless)

An invisible but tangible field of force surrounds the subject, providing a +20 bonus to Armor Class.
(UPDATE: This spell was previously +5/+5/+5/+5; it is now +20 armor)