Item passive stacking

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Item passive stacking describes the interactions between multiple items that have similar effects. The stacking of items fall into different categories, and the stacking of each category is handled differently.

Independent stacking[edit]

Multiplicative stacking[edit]

Values that are stacked in a multiplicative manner have 'diminishing returns'. This does not mean a reduction in effectiveness with multiple sources. The stacking effect can be calculated by the formula "1-(1-x)*(1-y)*(1-z)*..." where the variables x,y and z represent the individual percentages.

Magic resistance[edit]

Magic resistance stacks in a multiplicative manner. For example when a spell deals 100 magical damage, a hero's natural 25% magic resistance reduces it to 75 damage. Now when that hero has a Hood of Defiance, the 75 damage get reduced by 25% down to 56.25 damage. If he has a 2nd hood, that 56.25 damage get reduced by 25% down to 42.1875 damage, etc. Let's take Anti-mage (25% base magic resistance) with level 4 Spell Shield (50% magic resistance) and a Hood of Defiance icon.png Hood of Defiance (25% magic resistance): 1-(1-0.25)*(1-0.50)*(1-0.25)=0.71875 = 71.88% magic resistance.


The other attribute with this property is evasion.

Limited stacking[edit]

Those events stack multiplicatively, but in case two events 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 crits happen at the same time.

For example Tusk minimap icon.png Tusk holding a Daedalus icon.png Daedalus (230%) cannot crit while 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.

Tidehunter minimap icon.png Tidehunter receives no benefits from Stout Shield icon.png Stout Shield's damage block since Kraken Shell provides better values at higher levels.

Not stacking[edit]


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[edit]

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.