To know which bonuses stack, pay attention to the word...

[MythTrip]

One of my many newb confusions on this great sprawling beautiful epic of a game was how did weapons/bonuses stack. Pay attention to the exact word....ie weapon enhancement. I have a shaman spirit hunter who as a courtier gets rapier proficiency, thus +1 enhancement. So martial weapon +1 enhancement and spirit weapon ability +1 enhancement both do nothing. In my early experience (please correct if I'm mistaken) the +1 enhancement is easily obtainable in masterwork weapons in the game, dont bother getting it with character selection.

Same with armor..Luck bonus, delfection bonus and resistance bonuses do not stack...if you have any of those words in your equipped armor descriptions, further bonuses wont stack.

[vysionier]

Correct, but spirit weapon has an exception explained in the ability that it specifically stacks with a weapons’ existing enhancement bonus.

[Immortal Reaver]

And there is AC. Untyped, Natural Armor and Dodge do stack.
But Natural Type does not with itself. So Natual Enchantment (from Amulet) does not stack with Natural Enchantment (from Barskin) and etc.

[vysionier]

Originally posted by Immortal Reaver:

And there is AC. Untyped, Natural Armor and Dodge do stack.
But Natural Type does not with itself. So Natual Enchantment (from Amulet) does not stack with Natural Enchantment (from Barskin) and etc.

But doesn’t inherent (from class)and size bonus (from transmutation spell) stack to enhancement bonus to natural armor?

[Immortal Reaver]

Originally posted by vysionier:

Originally posted by Immortal Reaver:

And there is AC. Untyped, Natural Armor and Dodge do stack.
But Natural Type does not with itself. So Natual Enchantment (from Amulet) does not stack with Natural Enchantment (from Barskin) and etc.

But doesn’t inherent (from class)and size bonus (from transmutation spell) stack to enhancement bonus to natural armor?

Inherent? I do not think there is such type of Natural Armor. Do you mean like from Dragon Disciple? That is just Natural Armor.
Natural AC - this one stacks with itself.
Natural Size AC
Natural Enchantment AC
Those 3 are 3 types of different AC
If you get Legendary Proportion and get another source of Size Natural AC it will not stack.
If you cast maxed Barskin (+5) and Legendary Proportion (+6) you will get +11 AC, they do not stack since they are different type of AC.

It is just quite few people mistakenly think that Barskin + Legendary Proportion will only make Leg. Proportion work. So I threw it out here.

[MythTrip]

Immortal reaver, Man you know this cold, impressive. Youre a straight A student I can tell.

[RandomDude2018]

Some things stack and some don't. Wording doesn't matter.

[amiablequinn]

Stacking in this game is weird and poorly implemented.

Here is a brief primer:

General:
Bonuses of different types stack with each other.

AC:

Dodge and untyped bonuses always stack

Armor bonuses and armor Enhancement bonuses never (or shouldn't stack) Magic vestments used to stack but it was a bug they fixed so now it will only overwrite existing armor bonuses if it is higher (turning the spell form "must have" to "functionally useless"). Spells that give armor bonuses (mage armor) will not stack with armor.

Shield bonuses and shield enhancement bonuses do not stack

Natural armor class bonuses always stack unless they are the "enhancement" subtype of natural armor, effectively this means that the spell "barkskin" will not stack with an amulet of natural armor. But things like natural armor from class abilities (like alchemist mutagens, dragon disciple NA, arcane enforcer wooden flesh) do stack

Other bonuses (deflection, sacred profane, competence, morale, circumstances) do not stack.


Attack:

Bit simpler:

Enhancement bonuses should not stack HOWEVER Greater magic weapon currently DOES stack with your weapon enhancement. Expect this to be fixed in future patches.

Attack bonuses follow similar rules for armor bonuses: same does not stack with same, untyped always stacks.