Deflection bonus

A deflection bonus affects Armor Class and is granted by a spell or magic effect that makes attacks veer off harmlessly. Deflection bonuses stack with all other bonuses to AC except other deflection bonuses.

Sources of Deflection bonuses:
 * Items:
 * Armor or Shield of Stability +2 (True Neutral alignment only)
 * Iron Manacles +4 (Chaotic alignment only, from Delera's Tomb)
 * Spectacular Optics +3 (from South Threnal)
 * Kundarak Warding Bracers +3 (from Dragon chest)
 * Ring of the Silver Concord +2 (from Dragon chest)
 * Cloak of Shadows +2 (from Vampire chest)
 * Dusty Rose Ioun Stone +1
 * Spells:
 * Shield of faith +2-4 (exact formula: 2 + (caster level / 6), rounded down)
 * Protection from evil +2 (from attacks from evil creatures)
 * Protection from chaos +2 (from attacks from chaotic creatures; only cast by items at this time)

Other common bonuses to your armor class are armor bonus, shield bonus, dodge bonus, dexterity bonus, natural armor bonus, and miscellaneous bonus.