I've got a Kobold Draconic Bloodline Sorcerer (8th)/ Dragon Disciple (9th), and recently noticed that I am not sure how to calculate his Nat-AC.
1) Kobolds have a Nat AC of +1
2) From his Bloodline (Bloodline Power level 17) he gains +4 Nat AC
3) From his Dragon Disciple levels he gains an additional +3 Nat AC, it is stated that these are additive to the characters existing Nat AC.
Question 1:
Is the Nat AC +7 (since the Bloodline AC 'overrides' the racial Nat AC, or is it +8, because racial and bloodline Nat ACs do stack.
Question 2:
Since I am completly confused now, would a Amulet of Natural Armor raise the Nat AC further?
At 3rd level, you gain resist 5 against your energy type and a +1 natural armor bonus. At 9th level, your energy resistance increases to 10 and natural armor bonus increases to +2. At 15th level, your natural armor bonus increases to +4.
As his skin thickens, a dragon disciple takes on more and more of his progenitor's physical aspect. At 1st, 4th, and 7th level, a dragon disciple gains an increase to the character's existing natural armor (if any), as indicated on Table: Dragon Disciple. These armor bonuses stack.
+7
Yes.
Your reason for supposing the kobold and draconic bloodline not stacking is correct: they're both natural armour bonuses, and won't stack. The dragon disciple ability calls out that it stacks, so it does. An amulet of natural armour provides an enhancement bonus to existing natural armour, and thus stacks.
You have 7 natural armor normally. the bloodline is giving you natural armor, race gives natural armor, same type doesn't stack.
Amulet of Natural armor Enhances your natural armor. so it'll enhance your +7 by however much the amulet boosts.
Thanks for all your answers! :)