Mechanics thread

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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

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FaceLicker wrote:

other specific terms like 'physical' or 'elemental', changes exactly how the 50% is applied.

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FaceLicker wrote:

Using Malice's numbers it would be 10-20 base damage, 50% Increased Physical Damage, 30% Increased Physical Damage with Swords, and for the skill it would be either 40% 'Increased' or 'More' Damage.


Base damage: 10-20
Weapon damage: 10-20 x 1.5 = 15-30
Attack Damage: 15-30 x 1.3 = 19.5-39
(Increased)Skill Damage: 15-30 x 1.7 = 25.5-51

OR

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

Is this correct?

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FaceLicker wrote:

Right, I didn't mean to say they stack differently but merely that where(to which values) they are applied changes accordingly. I guess I should know by now that specifics are important!

I was just using the same format Malice used, lol. Blame him if it's confusing! =P