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Mortal Strike icon
▶️ This next one is gonna sting.

Critical strike is a passive ability that gives a chance to deal bonus damage on a successful attack.



Wraith King minimap icon Wraith King performing a critical strike.
The red number displays the resulting physical damage before reductions.

A Critical Strike's occurrence is determined upon beginning an attack, and not upon attack launch or attack landing.

For example, if the hero has Crystalys icon Crystalys and it starts an attack that procs Critical Strike, the attack applies Crystalys' Critical Strike value regardless of if the item is being upgrade in the middle of the attack animation. Or when attacking an enemy affected by Bloodthorn icon Soul Rend, and the debuff expires during an already started attack animation, that attack still applies the Critical Strike, since the attack started while the debuff was still present.

Visual Feedback[]

When a Critical Strike occurs, a red-colored number pops up on the victim of the strike, with a lightning bolt icon on the right side of the number. This number shows the multiplied damage value before reductions or amplifications. Therefore, the displayed value does not equal the damage the target actually took from the attack.


An attack that triggers Critical Strike has its total damage value multiplied by the given multiplier of the source of the Critical Strike. This means a critical strike is basically an attack damage amplifier, as it does not add extra damage on top of the attack damage, but directly increases the damage of the attack by multiplying it.

It can be defined as

Critical Strike Multiplier = 1 + MAX Ci

The multiplier is applied before any reductions or amplifications on the target or on the attacking unit. It only counts the unit's main attack damage, plus any bonus attack damage (percentage and flat bonuses) it has, meaning any damage instances (i.e. conditional attack damage bonuses) added to the attack damage which is separate from the attack damage itself is not considered by critical strikes.

Therefore, if an ability adds its damage directly to the attack damage, then it may be considered by Critical Strike, though there are exceptions to this. See total attack damage for the complete calculation.

All chance-based sources of Critical Strike use pseudo-random distribution.


Multiple critical strike procs are rolled from the strongest to the weakest multiplier, and stop rolling once proc occurs, so that two critical strikes cannot proc on the same attack, resulting in a diminishing behavior. This means when having multiple sources of chance-based crits, and the one with a higher multiplier proc, that attack is not counted for the other critical strike sources, since they did not roll. Thus their pseudo-random distribution states are preserved: the unrolled weaker critical strikes' current proc chance is neither increased nor reset for this attack.

For example, Tusk minimap icon Tusk's attack will not proc the critical strike of Daedalus icon Daedalus' (225%) while casting Walrus Punch icon Walrus PUNCH! because the latter ability has a higher critical strike value of 250%/325%/400%.

With cooldown-based critical strike sources (e.g. Mortal Strike icon Mortal Strike), this means that when a stronger value occurs, the cooldown-based critical strike stays unused and does not go on cooldown for that attack.

Attack Modifier Interactions[]

Main Article: Attack Modifier

Critical Strike fully stacks and does not interfere with any attack modifier. If an attack modifier increases or reduces attack damage, it is counted by the critical strike multiplier.

Abilities that grant conditional attack damage bonus may or may not be affected by the multiplier.

The following common attack modifiers is calculated after the critical strike, which increases the value during a proc/trigger:

Sources Affected[]

Conditional Attack Damage Bonus Affected by Critical Strike

Sources Not Affected[]

Main Articles: Bash and Mana Break
1 Requires Talent talent.
2a Requires Aghanim's Scepter icon Aghanim's Scepter.
2b Requires Aghanim's Shard icon Aghanim's Shard.
3 The ability's multishot / bounces can proc critical strike. The bonus spell damage is not considered by critical damage.

Critical Strike Sources[]

The amount of damage increase is defined as:

Critical Attack Damage = %Critical / %Proc

Chance-based Sources[]

1 Requires Talent talent.
2a Requires Aghanim's Scepter icon Aghanim's Scepter.
2b Requires Aghanim's Shard icon Aghanim's Shard.

Ensured Critical Strike Sources[]

1 Requires Talent talent.
2a Requires Aghanim's Scepter icon Aghanim's Scepter.
2b Requires Aghanim's Shard icon Aghanim's Shard.

Unique Critical Strike Sources[]

The following sources have the MODIFIER_PROPERTY_PREATTACK_TARGET_CRITICALSTRIKE flag. These sources proc critical strike upon the unit's attack point against the affected target.

Unique Critical Strike Sources
1 Requires Talent talent.
2a Requires Aghanim's Scepter icon Aghanim's Scepter.
2b Requires Aghanim's Shard icon Aghanim's Shard.


Critical Strike
Can be used by illusions.
Talent icon
There is no description for this ability.
Proc Chance: Varies
Critical Damage: Varies
Can be used by illusions.
Illusion Notes:
Critical strike values shown are before illusion outgoing damage and armor reduction.

  • Grants the hero's attacks a chance to deal critical damage.
  • Has the following values:
    • Proc chance: 24%/30%/20%/50%
    • Critical damage: 200%/200%/150%/400%
  • Increases attack damage by an average of 24%/30%/10%/150%.
  • The proc chances of multiple critical strike sources stack.
    • If two sources of critical strike proc at the same time, the higher multiplier has priority.

The following heroes have a Talent talent that grants them critical strike.

Bonus Level 10 Level 15 Level 20 Level 25
Left Right Left Right Left Right Left Right
Critical Strike
  • Mirana minimap icon +20%
  • Phantom Lancer minimap icon +24%

Version History[]

  • Multiple critical strike procs are now rolled from the strongest to weakest multiplier and stop rolling once a proc occurs. [?]