Damage Amplification: Difference between revisionsGive feedback

Multiple sources of abilities and items that display damage amplification percentages (e.g., +20% Damage) do not simply add together. Instead, they stack '''multiplicatively'''.

Multiple sources of abilities and items that display damage reduction percentages (e.g., -30% Damage) currently stack '''additively'''. Valve's May 22 patch notes state that Damage Reduction is intended to stack diminishingly (i.e., multiplicatively, in the same manner as Resistance)<ref>{{Update link|May|22|2026}}</ref>, but testing confirms this change has not yet been implemented, and Damage Reduction continues to add together in the current build.

<math>\text{Total Amplification Multiplier} = (1 + \text{A}_1) \times (1 + \text{A}_2) \times ...</math>

# A hero deals a base bullet damage of '''100'''.

# The hero gains '''15%''' damage amplification from an ability, increasing their damage from '''100''' to '''115''' (100 x 1.15 = 115).

# {{HeroIcon|Ivy}} casts {{AbilityIcon|Air Drop}} on the hero to give them an additional '''20%''' amplification.  

# The hero now deals '''138''' bullet damage (100 x 1.15 x 1.20 = 138).

'''Current formula:''' Damage Reduction from multiple sources adds together before being applied to the base damage.

<math>\text{Total Damage Reduction (Decimal)} = \text{DR}_1 + \text{DR}_2 + ...</math>

# A hero deals a base bullet damage of '''100'''.

# {{HeroIcon|Mirage}} casts base {{AbilityIcon|Fire Scarabs}} on the hero, reducing their damage by '''20%''', decreasing their bullet damage from '''100''' to '''80''' (100 x 0.8 = 80).

# {{HeroIcon|Mirage}} now afflicts the hero with {{ItemIcon|Inhibitor}}, reducing their damage by another '''30%'''.

# The hero now deals '''50''' bullet damage (100 x 0.5 = 50).

'''Intended formula (not currently active):''' Should Damage Reduction be changed to stack multiplicatively, the formula for the damage multiplier would be:

'''Example (hypothetical, not reflective of current gameplay):'''  

 

# A hero deals a base bullet damage of '''100'''.

# {{HeroIcon|Mirage}} casts base {{AbilityIcon|Fire Scarabs}} on the hero, reducing their damage by '''20%''', decreasing their bullet damage from '''100''' to '''80''' (100 x 0.8 = 80).

# {{HeroIcon|Mirage}} now afflicts the hero with {{ItemIcon|Inhibitor}}, reducing their damage by another '''30%'''.

# Under this formula, the hero would deal '''56''' bullet damage (100 x 0.56 = 56), rather than the 50 produced by the current additive formula.

 

Damage Amplification and Damage Reduction that apply to the attacker's own damage output, whether from self-inflicted items, ally buffs (such as {{AbilityIcon|Air Drop}}), or enemy debuffs (such as {{AbilityIcon|Fire Scarabs}} and {{ItemIcon|Inhibitor}}), are collectively referred to here as '''outgoing modifiers'''. In the current game version, all outgoing modifiers combine using the following process:

 

# Compute the '''Total Amplification Multiplier''' by multiplying all outgoing amplification sources as shown in the Amplification section.

# Compute the '''Total Damage Reduction (Decimal)''' by adding all outgoing reduction sources as shown in the Damage Reduction section.

 

Some sources of amplification instead apply to a specific target rather than the attacker, increasing the damage that target takes from the attacker's hits. These are referred to here as '''target modifiers''' and include effects such as {{AbilityIcon|Bloodscent}}'s bonus against isolated heroes. Target modifiers apply as a separate multiplier on top of the outgoing multiplier:

<math>\text{Damage} = \text{Base Damage} \times \text{Outgoing Multiplier} \times (1 + \text{Target Modifier})</math>

'''Example:'''

# The hero is attacking an isolated target and has {{AbilityIcon|Bloodscent}} active (a target modifier of '''+15%''').

# {{HeroIcon|Ivy}} casts {{AbilityIcon|Air Drop}} on the hero (an outgoing amplification of '''+20%''', so Total Amplification Multiplier = 1.20).

# {{HeroIcon|Mirage}} afflicts the hero with {{AbilityIcon|Fire Scarabs}} ('''-20%''') and {{ItemIcon|Inhibitor}} ('''-30%'''), giving Total Damage Reduction (Decimal) = 0.20 + 0.30 = 0.50.

# Outgoing Multiplier = 1.20 - 0.50 = 0.70.

# The hero deals '''81''' bullet damage (100 x 0.70 x 1.15 = 80.5, rounded up in game).