Armor bonus

An armor bonus is a bonus to Armor class from the armor that you are wearing. Armor bonuses do not stack.

Sources of Armor bonus:
 * Feats
 * Adamantine Body +8 (warforged only)
 * Composite Plating +2 (warforged only)
 * Mithral Body +5 (warforged only)
 * Items:
 * Armor +1-13 (bonus varies by armor type; magical enhancements contribute to the armor bonus by +1-5; note that armor may also limit the dexterity bonus to AC)
 * Docent +0-5 (docent, warforged only)
 * Armored Bracers +1-5
 * Black widow bracers +4 (obtained from Waterworks)
 * Delera's Vestment +2 (robe, obtained from Delera's Tomb)
 * Ironweave Robe +5 (robe, obtained from the Dragon chest)
 * Jeeka's Spangle +2 (trinket, from Stealthy repossession)
 * Ring of Trollish Regeneration +2 (ring, no longer in loot table)
 * Spells:
 * Mage armor +4

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