Natural armor bonus

Natural armor represents a creature's hide or magical effects that make skin thicker (such as Barkskin). Natural armor provides a bonus to AC.

Most items and spells provide plain "natural armor" modifier to AC. Only the highest effect applies. However, there are also some stacking bonuses to natural armor of with a different bonus type.

Natural armor bonus:
 * Named items
 * Random items with the suffix "of Natural Armor": +1 to +7
 * Random armor/shields with the prefixes Bracing / Bolstering / Buttressing: +1 to +3
 * Pirate Hat from Treasure of Crystal Cove +1 to +5
 * Spells/Potions:
 * Barkskin: +2 to +5
 * Spiderskin: +2 to +5
 * Toughen Construct: +2 to +5
 * Yugoloth potion: +4
 * Hezrou Cookie: +4
 * Crafting Property:
 * Cannith Crafting: +1 to +3
 * Dragontouched Armor: Sovereign Rune +4.
 * Sapphire of Natural Armor +1 to +7.

Primal bonus:
 * Rough Hide items

Miscellaneous bonuses:
 * Abishai Destroyer: +2 profane bonus to natural armor
 * Some Guild Airships buffs grant stacking bonuses to natural armor