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
- Bonus damage
- Bonus attributes (strength/agility/intelligence)
- Bonus mana/health (static amount)
- Bonus health regeneration/mana regeneration
- Bonus attack speed
- Bonus armor
- Cleave %
- Damage from Monkey King Bar
Items that stack independently do not interfere with each other in any way. If a Hero has two Monkey King Bars, each attack will trigger two separate chances to mini-bash, giving a 45.50% chance of one mini-bash and a 12.25% chance of two mini-bashes.
 Chance stacking
Items that chance stack are each given an opportunity to apply their effects, in order of highest effect to lowest.
- If a Hero buys both a Crystalys and a Daedalus, on every hit the Hero has a 20% chance of proccing a critical attack from Daedalus, a 15% chance from Crystalys, and a 5% chance of proccing both. Unlike the independent stacking, Daedalus overrides the Crystalys in the last case, because it has a higher critical damage multiplier and only one critical can proc on one hit.
- You have a Vanguard and then get a Stout Shield (on a melee hero): Since the Vanguard has a better block effect, you have a 80% chance to block 40 damage, an 12% chance to take 20 less damage and 8% chance to take normal damage.
- If a hero has a Butterfly (35% Evasion) and Heaven's Halberd (25% Evasion) then the hero has a 51.25% change to evade and a 48.75% chance to be hit.
 Items that do not stack
Multiple Bloodstones do not reduce respawn time further. Only the Bloodstone in the highest priority slot works.
- Priority slots are as follows:
- 1 2 3
- 4 5 6
 Skull Basher
The strength and damage components of multiple Skull Bashers will independently stack, but the bash chance will not.
 Magic resistance
There are two instances of a Hero missing an attack, from a status effect exhibited by the attacking unit such as being drenched in Brewmaster's Drunken Haze, or from an ability exhibited by the attacked unit such as Windranger's Windrun. The two are considered separate instances, where the former triggers upon attack while the latter triggers upon receiving damage. In a sense, if a Hero were to miss his attack, the dice for evasion would not roll. If the Hero does successfully proc where his attack goes through the debuff, then the dice for evasion roll. As of patch 6.79, evasion stacks diminishingly.
Auras do not stack with themselves, since they place a buff on the unit. Only the aura with the highest value will work. Note that some items share a specific aura (Ring of Basilius and Vladmir's Offering). In this case, only Vladimir's Offering's mana regeneration aura and armor aura will work.
 Unique Attack Modifiers