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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.

Independent stacking[]

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.

Anti-Mage minimap icon.png Anti-Mage at level 25 with a Platemail icon.png Platemail has:
Armor = base armor + bonus armor = 15.2 + 10 = 25.2 armor

Effects that stack independently[]

Multiplicative stacking[]

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.


Anti-Mage minimap icon.png Anti-Mage with level 4 Counterspell and a Cloak icon.png Cloak has a magic resistance of:
1 - (1 - 0.25) × (1 - 0.45) × (1 - 0.15) = 64.9375%

Effects that stack multiplicatively[]

Limited stacking[]

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[]

Critical strike procs are rolled from the strongest to weakest multiplier, and stop rolling once proc occurs, so that two critical strikes cannot proc on the same attack, resulting in a diminishing behavior.

For example Tusk minimap icon.png Tusk holding a Daedalus icon.png Daedalus (230%) cannot crit when using Walrus PUNCH! (350%).

Damage block[]

Only one instance of damage block can proc at a time. The highest damage block value has priority.

Not stacking[]


The strength and damage components of multiple Skull Basher icon.png Skull Bashers and Abyssal Blade icon.png Abyssal Blades will independently stack, but the bash chance will not.

Chain Lightning[]

The attack speed and damage components of multiple Maelstrom icon.png Maelstroms and Mjollnir icon.png Mjollnirs will independently stack, but the chain lightning chance will not.


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.