Armor bonus is the natural protection afforded by armors. It does not stack. The highest protection is used to determine armor class. Certain metals provide an additional bonus to the normal armor bonus afforded by the armor. A blutium suit of full plate provides an additional +4 natural enchantment bonus. Although it says enchantment, it just means that the bonus is added to the total armor bonus and cannot stack with other natural enchantment bonuses. There are also divine armor class bonuses that come from making an item at a Godforge. Profane bonus is another type of bonus that comes from evil forges or the natural qualities of some creatures. Divine and profane bonuses are another way of getting an increase in armor class.
When determining cost, multipliers are applied from least to highest, thus a suit of Godforge Blutium Full Plate would apply the x5 price modifier to the base armor (1,500 gp) and then the x20 price multiplier for being Godforged. The calculation (1,500 x 5) x20 = 150,000 gp.
This list shows some of the possible combinations that can be purchased.
Battle Plate | +9 | 2,500 gp
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Godforge High Alloy Blutium Battle Plate | +19 | 500,000 gp
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Breastplate | +5 | 200 gp
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Black Silver Breastplate | +6 | 1,700 gp
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Half-Plate | +7 | 600 gp
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Krephus Plate Half-Plate | +9 | 2,800 gp
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Blutium Half-Plate | +11 | 3,100 gp
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Full Plate | +8 | 1,500 gp
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High Alloy Blutium Full Plate | +13 | 15,000 gp
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Queen Carapace Armor | +7 | 3,000 gp
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Muneyd'vith Hide | +5 | 2,700 gp
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Widowmaker Silk Fine Robe | +1 | 1,020 gp
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Feyweave Widowmaker Silk Fine Robe | +2 | 3,020 gp
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Feyweave Svatir Robe | +3 | 4,000 gp
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+2 Svatir Robe | +4 | 5,000 gp
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+2 Bracers of Armor (see DMG) | +2 | 4,000 gp
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Build: Two-Hander Grafted Configuration - AC: 34
+9 natural bonus | Battle Plate
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+3 natural enchantment bonus | Blutium Battle Plate
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+5 enchantment bonus | +5 Blutium Battle Plate
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+1 deflection bonus | dexterity bonus capped at +1 for armor type
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+4 natural AC | beholder graft Plated Skin
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+2 divine bonus | received the Boon of the War Spirit Shrine
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Build: Buckler Scout Grafted Configuration - AC: 33
+7 natural bonus | Queen Carapace Armor
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+4 enchantment bonus | +4 Queen Carapace Armor
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+4 deflection bonus | high Dexterity (18-19)
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+3 natural AC | yuan-ti graft Scaly Skin
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+1 natural bonus | buckler
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+4 enchantment bonus | +4 buckler
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Build: Meat Shield Hero Configuration - AC: 35
+9 natural bonus | Battle Plate
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+5 natural enchantment bonus | High Alloy Blutium Battle Plate
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+5 divine bonus | Godforge
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+5 enchantment bonus | +5 Godforge High Alloy Blutium Battle Plate
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+1 deflection bonus | dexterity bonus capped at +1 for armor type
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+2 natural bonus | large Demiurgic Iron shield
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+3 natural enchantment bonus | Demiurgic Iron
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+5 enchantment bonus | +5 Demiurgic Iron shield
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