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)
 * Mithral Body +5 (warforged only)
 * Composite Plating +2 (warforged only)
 * Items:
 * Various kind of 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 +1-8
 * Black Widow Bracers +4 (obtained from The Lost Seekers aka Waterworks)
 * Jidz-Tet'ka +5 (bracers, obtained from Unraveling Enchantments crafting)
 * Ironweave Robe +5 (obtained from the Plane of Night raid)
 * White Dragonscale Robe +6
 * Dragontouched Robe/Outfit +6
 * 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.