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'''Damage Amplification''' or '''Damage Amp''' is a stat that multiplies the damage caused by the player to affected enemies and NPCs. It can be both positive and negative. In latter case it reduces damage and is also known as '''Damage Reduction'''.

 

 

* '''Additive Amps:''' These add together with each other (including additive Damage Reductions) into a single pool.

* '''Instance Amps:''' These are nearly identical to multiplicative amps, main exception being they create a new instance of damage.

 

 

Based on testing, the generalized formula for how these amps apply to weapon damage is as follows:

 

 

 

# A hero has a base bullet damage of '''100''' and '''0''' flat weapon damage for simplicity.

# The hero parries an enemy hero (Multiplicative Amp of '''+25%''' against parried target''')'''. This is applied after the additive pool. The hero now deals '''112.5''' damage (90 * 1.25 = 112.5).

 

 

==== Additive Amplifiers ====

| rowspan="1" |{{HeroIcon|Calico}}  

| rowspan="1" |{{AbilityIcon|Ava}}  

|'''+{{#invoke:Abilities|get_ability_upgrade_prop|Ava|3|OutgoingDamagePercent}}%''' Ramping Damage Amp

| rowspan="2" |{{HeroIcon|Shiv}}

| rowspan="2" |{{AbilityIcon|Killing Blow}}

|'''+{{#invoke:Abilities|get_ability_prop|Killing Blow|BuffDamage}}%''' Damage Amp

|'''+{{#invoke:Abilities|get_ability_upgrade_prop|Killing Blow|2|BuffDamage}}%''' Damage Amp

|{{ItemIcon|Rebuttal}}

|'''+{{ItemData|Rebuttal|BonusDamagePercent}}''' Damage Amp

 

 

|'''+{{#invoke:Abilities|get_ability_upgrade_prop|Scorn|3|DamageBonus}}%''' Damage Amp per Stack

 

 

| rowspan="2" |{{HeroIcon|Paradox}}

| rowspan="2" |{{AbilityIcon|Pulse Grenade}}

|'''+{{#invoke:Abilities|get_ability_prop|ability_magician_animalhexarea|DamageAmpPercentage}}%''' Damage Amp

 

 

| rowspan="2" |{{HeroIcon|Billy}}

| rowspan="2" |{{AbilityIcon|Blasted}}

|'''+{{#invoke:Abilities|get_ability_prop|Radiant Daggers|MagicIncreasePerStack}}%''' Spirit Damage Amp per Stack

|'''+{{#invoke:Abilities|get_ability_upgrade_prop|Radiant Daggers|3|MagicIncreasePerStack}}%''' Spirit Damage Amp per Stack

== Damage Reduction ==

 

 

=== Damage Reduction Stacking ===

 

Valve's May 22 patch notes state that Damage Reduction debuffs are intended to stack diminishingly (i.e., multiplicatively, in the same manner as Resistance)<ref>{{Update link|May|22|2026}}</ref>.

 

 

==== Weapon and Spirit Reduction ====

|{{HeroIcon|Silver}}

|{{AbilityIcon|Boot Kick}}

| -35% Damage Reduction

* {{ItemIcon|Cheat Death}}, {{ItemIcon|Golden Goose Egg}} and {{ItemIcon|Cursed Relic}} reduce damage dealt by its user.

 

Spirit Damage Reduction from {{HeroIcon|Infernus}}'s {{AbilityIcon|Afterburn}} (T2) and {{ItemIcon|Silencer}} does '''not''' behave like standard Damage Reduction. Multiple sources of Spirit‑specific reduction stack additively with each other (e.g., Afterburn T2 + Silencer = sum of percentages). This combined spirit reduction is then applied as a '''separate multiplier''', multiplicative with all other additive amps such as {{ItemIcon|Inhibitor}}.

|+List of heroes and items

!Hero / Item

|2

|'''{{#invoke:Abilities|get_ability_upgrade_prop|Afterburn|2|OutgoingTechDamagePercent}}%''' Spirit Damage Reduction <br><small>'''Note:''' Additive with itself, but multiplicative with other additive amps.</small>

 

* '''Additive Amps''' do not apply to many flat values, such as flat weapon damage bonuses, base damage for Melee abilities (Such as the bonus +60 damage from {{HeroIcon|Calico}}'s {{AbilityIcon|Leaping Slash}} T3 upgrade), {{ItemIcon|Capacitor}} active, {{AbilityIcon|Backstabber}}, etc.

* {{ItemIcon|Silencer}} and {{HeroIcon|Infernus}}'s {{AbilityIcon|Afterburn}} Tier 2 Spirit Damage Reduction are exceptions to the standard Damage Reduction rule. They stack additively with themselves, but multiplicatively with other additive amps.

* {{HeroIcon|Celeste}}'s Spirit damage amp from {{AbilityIcon|Radiant Daggers}} works like a multiplicative amp but is affected by additive amp bugs (see the Additive Amps entry above).