You draw upon your arcane power to enhance your shield or armor with magical energy.
Prerequisite: Ability to cast arcane spells.
Benefit: As a swift action, you can imbue either your armor or your shield with a fraction of your power. For 1 round, an imbued shield or set of armor gains a +1 enhancement bonus to its Armor class. For every five caster levels you possess, this bonus increases by +1, to a maximum of +5 at 20th level.
Adventurer’s Handbook: Genius Guide Volume 1