Item passive stacking
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Item passive stacking describes the interactions between multiple items that have similar effects. The stacking of effects and items falls into different categories, and each category behaves differently.
Contents
Independent stacking[edit]
Effects stack independently if they stack additively. This is the simplest and most intuitive type of stacking: multiple effects or attributes will add to each other.
- Example
- Anti-Mage at level 25 with a Platemail has:
- Armor = base armor + bonus armor = 14.2 + 10 = 24.2 armor
Effects that stack independently[edit]
- Bonus attack damage
- Bonus attributes (strength/agility/intelligence)
- Bonus mana/health (static amount)
- Bonus health regeneration/mana regeneration
- Bonus attack speed
- Bonus armor
- Lifesteal
- Mana Break (with the exception for Anti-Mage's mana break which does not stack with that of Diffusal Blade)
- Movement Speed bonuses from different categories (some items fall in the same category and therefore only the highest value applies, for example: Boots)
- Cleave damage (with the particularity that the damage from multiple instances of cleave is not actually added: each instance deals independent damage)
- Maim (which no longer exists)
Multiplicative stacking[edit]
Values that are stacked in a multiplicative manner have diminishing returns. The stacking effect can be calculated with the formula:
Total stack = 1 − ((1 − first instance) × (1 - second instance) × (1 - third instance) × ...)
where each instance is a percentage.
Example:
- Anti-Mage with level 4 Counterspell and a Cloak has a magic resistance of:
- 1 - (1 - 0.25) × (1 - 0.45) × (1 - 0.15) = 64.9375%
Effects that stack multiplicatively[edit]
Limited stacking[edit]
These effects stack multiplicatively, but when two instances of the same effect happen at the same time, only the highest value is kept or the duration is refreshed.
Critical Strike[edit]
The highest crit multiplier has priority in case two critical strikes happen at the same time.
For example Tusk holding a Daedalus (230%) cannot crit when using Walrus PUNCH! (350%).
Damage block[edit]
Only one instance of damage block can proc at a time. The highest damage block value has priority.
Not stacking[edit]
Bash[edit]
The strength and damage components of multiple Skull Bashers and Abyssal Blades will independently stack, but the bash chance will not.
Chain Lightning[edit]
The attack speed and damage components of multiple Maelstroms and Mjollnirs will independently stack, but the chain lightning chance will not.
Auras[edit]
Auras provided by items do not stack with themselves, since they place a buff/debuff on the unit. Only the aura with the highest value will work.
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