barbarism don't add the max fire resist but decrease it

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Webhamstere wrote:

- purity of fire lvl 20 in alpha's howl with empower (5%) + increase effects of auras (54%) + increase effect buff on you (21%) = (5 * 1.54%) * 1.21 = 9.3

No, the increases are additive modifiers applying to the same value (effect of the aura on you), they stack additively.
5 * (1 + 0.54 + 0.21) = 5 * 1.75 = 8.75 (rounds to 8)

@grinningpit a screenshot might help, yes.

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MaXimillionZero wrote:

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mark1030 wrote:

But they both are referring to the effect on YOU. Your aura has an effect on you. Somebody else's aura has an effect on you. Buff's have effect on you.

If somebody has increased spell damage and they case a spell on you, and you're shocked so you have increased damage taken, those stack multiplicatively, because one the first effect affects the caster, and the second affects the target.

No. That's not the reason; this seems to be the source of your confusion. They work the way they do because one of them affects your damage value (technically the damage range) of the skill, and one affects the damage taken. These are different values (though related), and modifiers to one cannot be modifiers to the other - it's not even technically correct to say they stack multiplicatively with each other, as they don't in a strict sense stack with each other at all: one applies to one value, and the other applies at a later time to a second, different value (which was calculated in part but not entirely based on the result of the first value, which is why it's "close enough" to say they stack multiplicatively).

It doesn't matter where these effects are sourced from, only that one is affecting the damage of the skill, and one is affecting damage taken, and that these are inherently not the same value - modifiers to different values fundamentally can't stack additively.

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MaXimillionZero wrote:

EDIT: One more example: If 'increased spell damage' was instead 'increased damage of spells you cast', would you then suddenly expect it to stack additively instead of multiplicatively with Taryn's Shiver or Shock? Because that's what happening with the aura nodes.

This isn't analogous at all - both "increased spell damage" and "increased damage of spells you cast" are clearly affecting the damage of the spell, not damage taken. But a theoretical modifier which said "Damage taken caused by your spells is increased by 10%" would be additive with other increases to damage taken like Shock and Taryn's Shiver, because that's a modifier to damage taken rather than the spell's damage value.

The only thing that matters is what value a modifier applies to - "increased" and "reduced" modifiers to the same value - regardless of how that modifier identifies that value: "increased spell damage", "increased elemental damage" and "increased damage against rare monsters" can all apply the the same value if that value is a value of elemental spell damage on a skill used against a rare monster. Similarly "increased effect of auras you cast" and "increased effect of bufs on you" can apply to the same value if that value is the effect an aura buff that you cast is having on you.

This cannot apply in modifiers to different values, such as a modifier to damage and a modifier to damage taken.
Where the modifiers come from or how they describe/identify the value they're applying to can not and does not matter.

It occurs to me that this might be easier to illustrate with a picture, but I don't have time to create one at the moment.