Dual Strike question

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Malice wrote:

Modifier stacking for skills
Calculations for skills are slightly different, in that the damage stacks multiplicatively between gear (weapons), passive skills, and the skill itself. Modifiers from gear other than weapons are treated the same way as passive skills - they take effect after any on-weapon modifiers, and stack additively with passive skills.

For example, if you had a sword with base 10-20 damage and +50% damage, passive skills granting another +30% sword damage, and used a skill that gave yet another +40% damage, the calculation would would look like this:

Base damage: 10-20
Weapon damage: 10-20 x 1.5 = 15-30
Attack Damage: 15-30 x 1.3 = 19.5-39
Skill Damage: 19.5-39 x 1.4 = 27-55

For spells, there is no difference between on-weapon and off-weapon modifiers. Modifiers from weapons, gear, and passive skills stack additively with each other. Any modifiers on the spell or attached support gems will then stack multiplicatively with that amount.

For example, if you had a spell that did 10-20 base fire damage, passive skills granting +20% fire damage, +60% spell damage on your weapon, +10% spell damage on a ring, and +30% damage on a support gem:

Base damage: 10-20
Spell damage: 10-20 x (1 + 0.2 + 0.6 + 0.1) = 19-38
Skill Damage: 19-38 x 1.3 = 25-49

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Mark_GGG wrote:

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Malice wrote:

Modifier Stacking
Testing of the order modifiers take effect is currently not exhaustive, so there may be inaccuracies here. Especially, quality on gems is difficult to test.
In general (but not always), percentage modifiers stack additively, and integer modifiers are applied before percentages.

Imagine I have 100 life, and two passive skills that increase total life by 15%. The total bonus will be 30%, resulting in 130 life.
Now imagine I am wearing boots that give +40 life, and have a passive skill that grants +20 life. The integer bonuses are applied first, giving me 160 life, then the percentage bonuses are applied to that subtotal, for a final total of 208 life.

One exception is the quality modifier on armour and flasks (but not weapons), which applies after all other modifiers. For example:

[there was an item linked here that has since been wiped. It had +69 armour, +9% armour, and +20% quality]

This Horned Casque has a base armour rating of 428. Then the +69 is added to get 497 armour. Then the 9% bonus raises it to 541, and finally +20% quality results in 650 armour.

Quality on weapons stacks additively with other % modifiers on the weapon.


Modifier stacking for skills
Calculations for skills are slightly different, in that the damage stacks multiplicatively between gear (weapons), passive skills, and the skill itself. Modifiers from gear other than weapons are treated the same way as passive skills - they take effect after any on-weapon modifiers, and stack additively with passive skills.

For example, if you had a sword with base 10-20 damage and +50% damage, passive skills granting another +30% sword damage, and used a skill that gave yet another +40% damage, the calculation would would look like this:

Base damage: 10-20
Weapon damage: 10-20 x 1.5 = 15-30
Attack Damage: 15-30 x 1.3 = 19.5-39
Skill Damage: 19.5-39 x 1.4 = 27-55

For spells, there is no difference between on-weapon and off-weapon modifiers. Modifiers from weapons, gear, and passive skills stack additively with each other. Any modifiers on the spell or attached support gems will then stack multiplicatively with that amount.

For example, if you had a spell that did 10-20 base fire damage, passive skills granting +20% fire damage, +60% spell damage on your weapon, +10% spell damage on a ring, and +30% damage on a support gem:

Base damage: 10-20
Spell damage: 10-20 x (1 + 0.2 + 0.6 + 0.1) = 19-38
Skill Damage: 19-38 x 1.3 = 25-49

There are all kinds of wrong in here which have been confusing people in other threads.
All "% increased" or "% reduced" modifiers to a particular value stack additively with each other, while "% more" and "% less" modifiers stack multiplicatively. "additional" adds directly to the value (most commonly used on things like resistances), and in general "removes" or "subtracts" is I think used as the inverse of that depending on context.
The only major exception to the above that I am aware of is that "% increased" modifiers to weapon damage which are on that weapon will stack additively with ohter modifiers of the same type (if you can get multiples on the same weapon, which I'm not sure is possible at the moment), but because they modify the base damage of the weapon, they technically stack multiplicatively with other, off-weapon increases, which work off the base damage of the weapon, including the modifications from the weapon's own stats. Let me know if you have any other questions and I will do my best to clear them up.

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Mark_GGG wrote:

As explained in the skill thread for dual strike (and quoted here), the DPS calculation for this skill is wrong because it doesn't know the skill will hit with both weapons, and calculates as though it was alternating between the two.