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A '''Stack''' is a scaling effect or buff that can be increased through specific means or actions. Stacks are most often applied through dealing damage, where one instance applies one stack. Most stacking effects are built up quickly and are only temporary, disappearing all at once after their duration runs out. Additionally, there are stacking bonuses that apply directly to heroes, making them stronger, with a few of these bonuses sometimes being permanent. Only a handful of heroes can infinitely stack, allowing them to constantly scale as a game goes on.

While most stacking items effects are temporary, a few keep their stacks under various conditions. {{ItemIcon|Glass Cannon}} loses a stack upon death. {{ItemIcon|Restorative Locket}} spends its charges to heal the hero. {{ItemIcon|Trophy Collector}} has permanent stacks.

See [[Build-Up]] for abilities and items that trigger an effect after reaching 100% of a damage metric.

== Items with Stacking Effects ==
{| class="wikitable sortable"
|-
! Name !! {{Souls}} Cost !! Category !! Stat change per stack !! Max stacks !! Max stat change
|-
| {{ItemIcon|Split Shot}} || {{#invoke:ItemData|get_cost|Split Shot}} || {{#invoke:ItemData|get_type|Split Shot}} || +{{#invoke:ItemData|get_prop|Split Shot|WeaponDamagePerStack}} Weapon Damage per stack || {{#invoke:ItemData|get_prop|Split Shot|MaxStacks}} || +60% Weapon Damage at max stacks
|-
| {{ItemIcon|Berserker}} || {{#invoke:ItemData|get_cost|Berserker}} || {{#invoke:ItemData|get_type|Berserker}} || +{{#invoke:ItemData|get_prop|Berserker|WeaponPowerPerStack}} Weapon Damage per stack || {{#invoke:ItemData|get_prop|Berserker|MaxStacks}} || +70% Weapon Damage at max stacks
|-
| {{ItemIcon|Ballistic Enchantment}} || {{#invoke:ItemData|get_cost|Ballistic Enchantment}} || {{#invoke:ItemData|get_type|Ballistic Enchantment}} || +{{#invoke:ItemData|get_prop|Ballistic Enchantment|WeaponPowerPerStack}} Weapon Damage per stack<br />+{{#invoke:ItemData|get_prop|Ballistic Enchantment|WeaponPowerPerStackNonHero}}% Weapon Damage per stack from non-Hero sources || {{#invoke:ItemData|get_prop|Ballistic Enchantment|NonHeroStackLimit}} (Stacks only capped vs non-Hero sources) || +140% Weapon Damage (Theoretical limit if damaging all 6 enemy heroes and 8 non-Hero enemies)
|-
| {{ItemIcon|Escalating Resilience}} || {{#invoke:ItemData|get_cost|Escalating Resilience}} || {{#invoke:ItemData|get_type|Escalating Resilience}} || +{{#invoke:ItemData|get_prop|Escalating Resilience|BulletResistPerStack}} Bullet Resist per stack || 15 || +30% Bullet Resist at max stacks
|-
| {{ItemIcon|Spirit Rend}} || {{#invoke:ItemData|get_cost|Spirit Rend}} || {{#invoke:ItemData|get_type|Spirit Rend}} || {{#invoke:ItemData|get_prop|Spirit Rend|MagicResistReduction}} Spirit Resist on Headshot per stack on target || {{#invoke:ItemData|get_prop|Spirit Rend|MaxStacks}} || -28% Spirit Resist at max stacks on target
|-
| {{ItemIcon|Crushing Fists}} || {{#invoke:ItemData|get_cost|Crushing Fists}} || {{#invoke:ItemData|get_type|Crushing Fists}} || {{#invoke:ItemData|get_prop|Crushing Fists|BulletResistReduction}} Bullet Resist per stack on target || {{#invoke:ItemData|get_prop|Crushing Fists|MaxStacks}} || -30% Bullet Resist at max stacks on target
|-
| {{ItemIcon|Glass Cannon}} || {{#invoke:ItemData|get_cost|Glass Cannon}} || {{#invoke:ItemData|get_type|Glass Cannon}} || +{{#invoke:ItemData|get_prop|Glass Cannon|FireRatePerKill}} Weapon Fire Rate per stack || {{#invoke:ItemData|get_prop|Glass Cannon|MaxStacks}} || +56% Fire Rate at max stacks
|-
| {{ItemIcon|Spellslinger}} || {{#invoke:ItemData|get_cost|Spellslinger}} || {{#invoke:ItemData|get_type|Spellslinger}} || +{{#invoke:ItemData|get_prop|Spellslinger|BonusFireRate}} Weapon Fire Rate and {{#invoke:ItemData|get_prop|Spellslinger|ReloadSpeedMultipler}} Reload Time per stack || {{#invoke:ItemData|get_prop|Spellslinger|MaxStacks}} || +66% Fire Rate and -60% Reload Time at max stacks
|-
| {{ItemIcon|Restorative Locket}} || {{#invoke:ItemData|get_cost|Restorative Locket}} || {{#invoke:ItemData|get_type|Restorative Locket}} || +{{#invoke:ItemData|get_prop|Restorative Locket|HealPerStack}} Heal per stack || {{#invoke:ItemData|get_prop|Restorative Locket|MaxStacks}} || +400 Heal at max stacks (before [[Boon]] Scaling)
|-
| {{ItemIcon|Trophy Collector}} || {{#invoke:ItemData|get_cost|Trophy Collector}} || {{#invoke:ItemData|get_type|Trophy Collector}} || +{{#invoke:ItemData|get_prop|Trophy Collector|StackingBonusSprintSpeed}}/s Sprint Speed<br />+{{#invoke:ItemData|get_prop|Trophy Collector|StackingTechRangeMultiplier}} Ability Range<br />+{{#invoke:ItemData|get_prop|Trophy Collector|StackingGoldPerMinute}} Souls per minute || {{#invoke:ItemData|get_prop|Trophy Collector|MaxStacks}} || +2.4m/s Sprint Speed +12% Ability Range +288 Souls per minute at max stacks
|-
| {{ItemIcon|Mystic Regeneration}} || {{#invoke:ItemData|get_cost|Mystic Regeneration}} || {{#invoke:ItemData|get_type|Mystic Regeneration}} || {{#invoke:ItemData|get_prop|Mystic Regeneration|Regeneration}}HP/s Health Regeneration per stack || 6 || 24HP/s Health Regeneration at max stacks
|-
| {{ItemIcon|Radiant Regeneration}} || {{#invoke:ItemData|get_cost|Radiant Regeneration}} || {{#invoke:ItemData|get_type|Radiant Regeneration}} || {{#invoke:ItemData|get_prop|Radiant Regeneration|Regeneration}}HP/s Health Regeneration per stack || 6 || 24HP/s Health Regeneration at max stacks (before [[Spirit_power#spirit_power_scaling|Spirit Scaling]])
|-
| {{ItemIcon|Escalating Exposure}} || {{#invoke:ItemData|get_cost|Escalating Exposure}} || {{#invoke:ItemData|get_type|Escalating Exposure}} || +{{#invoke:ItemData|get_prop|Escalating Exposure|MagicIncreasePerStack}} Spirit Amp per stack || {{#invoke:ItemData|get_prop|Escalating Exposure|MaxStacks}} || +54% Spirit Amp at max stacks
|}

== Heroes with Stacking Effects ==
{| class="wikitable sortable"
|-
! Hero !! Ability !! Effect
|-
| {{HeroIcon|Billy|size=30px}} || {{AbilityIcon|Blasted}} || Billy gains bonus health and increases Blasted duration for dealing melee attacks while Blasted
|-
| {{HeroIcon|Celeste|size=30px}} || {{AbilityIcon|Radiant Daggers}} || Celeste gains increased spirit damage when the beam hits an enemy hero
|-
|{{HeroIcon|Graves|size=30px}} || {{AbilityIcon|Essence Theft}} (passive) || Graves gradually steals Weapon Damage and Spirit Resist from shooting a target
|-
| {{HeroIcon|Haze|size=30px}} || {{AbilityIcon|Fixation}} (passive) || Haze gains increased bullet damage to targets the more stacks they have
|-
| {{HeroIcon|Kelvin|size=30px}} || {{AbilityIcon|Arctic Beam}} || Gradually applies increasing Movement and Fire Rate Slow on enemies
|-
| {{HeroIcon|Lady Geist|size=30px}} || {{AbilityIcon|Malice}} || Causes targets to take increased damage from Lady Geist
|-
| {{HeroIcon|Paradox|size=30px}} || {{AbilityIcon|Pulse Grenade}} || Applies stacking damage amp to targets, granting increased damage against them
|-
| {{HeroIcon|Pocket|size=30px}} || {{AbilityIcon|Barrage}} || Gradually increases Pocket's overall damage as it hits targets
|-
| {{HeroIcon|Shiv|size=30px}} || {{AbilityIcon|Serrated Knives}} || Increases the bleed's damage over time and refreshes its duration
|-
| {{HeroIcon|Mirage|size=30px}} || {{AbilityIcon|Djinn's Mark}} (passive) || Builds up stacking spirit damage that can be triggered automatically or by Mirage
|-
| {{HeroIcon|Mo & Krill|size=30px}} || {{AbilityIcon|Scorn}} (T3) || Applies stacking damage amp to targets, granting increased damage against them
|-
|{{HeroIcon|Vyper|size=30px}}
|{{AbilityIcon|Screwjab Dagger}}
|Applies a stacking movement slow, with the T2 upgrade also applying a stacking bullet resist shred.
|}

== Heroes with Permanent Stack Bonuses ==
{| class="wikitable sortable"
|-
! Hero !! Ability !! Bonus per Stack !! Max Stacks
|-
| {{HeroIcon|Bebop|size=30px}} || {{AbilityIcon|Sticky Bomb}} || +{{#invoke:Abilities|get_ability_prop|Sticky Bomb|BonusDamagePctPerPlayerKilled}}% bonus damage per enemy killed, +{{#invoke:Abilities|get_ability_prop|Sticky Bomb|BonusDamagePctPerPlayerHit}}% per enemy hurt || Infinite
|-
| {{HeroIcon|Drifter|size=30px}} || {{AbilityIcon|Bloodscent}} || +{{#invoke:Abilities|get_ability_prop|Bloodscent|WeaponDmgPerIsolationKill}}% Weapon Damage per isolation kill, +{{#expr: {{#invoke:Abilities|get_ability_prop|Bloodscent|WeaponDmgPerIsolationKill}}*({{#invoke:Abilities|get_ability_prop|Bloodscent|IsolationAssistPercentValue}} / 100)}}% per assist || Infinite
|-
| {{HeroIcon|Grey Talon|size=30px}} || {{AbilityIcon|Guided Owl}} || +{{#invoke:Abilities|get_ability_prop|Guided Owl|BonusTechPowerPerKill}} Permanent Spirit Power per enemy killed || Infinite
|-
| {{HeroIcon|Mina|size=30px}} || {{AbilityIcon|Nox Nostra}} || +2 bats released during Nox Nostra per {{AbilityIcon|love bites}} trigger against heroes || Infinite
|-
| {{HeroIcon|Mo & Krill|size=30px}} || {{AbilityIcon|Combo}} || +{{#invoke:Abilities|get_ability_prop|Combo|BonusHealthOnKill}} Bonus Max Health per enemy killed during or within 3s of Combo ending || Infinite
|-
|{{HeroIcon|Vindicta|size=30px}}
|{{AbilityIcon|Assassinate}}
| +6% weapon damage per enemy killed with or within 4s of being hit with Assassinate, increased to +10% with T3 upgrade
|Infinite
|}

{{Navbox gameplay}}