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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, 
Glass Cannon and 
Restorative Locket are the only items to semi-permanently keep their stacks, and require certain conditions to lose them.
See Build-Up for abilities and items that trigger an effect after reaching 100% of a damage metric.
Items with Stacking Effects
| Name |  Cost |
Category | Stat change per stack | Max stacks | Max stat change |
|---|---|---|---|---|---|
 Split Shot |
1,600 | Weapon | +8% Weapon Damage per stack | 5 | +60% Weapon Damage at max stacks |
 Berserker |
3,200 | Weapon | +7% Weapon Damage per stack | 10 | +70% Weapon Damage at max stacks |
 Ballistic Enchantment |
3,200 | Weapon | +20% Weapon Damage per stack +5% Weapon Damage per stack from non-Hero sources |
8 (Stacks only capped vs non-Hero sources) | +140% Weapon Damage (Theoretical limit if damaging all 6 enemy heroes and 8 non-Hero enemies) |
 Escalating Resilience |
3,200 | Weapon | +2% Bullet Resist per stack | 15 | +30% Bullet Resist at max stacks |
 Spirit Rend |
3,200 | Weapon | -7% Spirit Resist on Headshot per stack on target | 4 | -28% Spirit Resist at max stacks on target |
 Crushing Fists |
6,400 | Weapon | -5% Bullet Resist per stack on target | 6 | -24% Bullet Resist at max stacks on target |
| Glass Cannon |
6,400 | Weapon | +7% Weapon Fire Rate per stack | 8 | +64% Fire Rate at max stacks |
 Spellslinger |
6,400 | Weapon | +11% Weapon Fire Rate and -10% Reload Time per stack | 6 | +60% Fire Rate and -60% Reload Time at max stacks |
| Restorative Locket |
1,600 | Vitality | +16  x0.5 Heal per stack |
25 | +400 Heal at max stacks (before Boon Scaling) |
 Trophy Collector |
1,600 | Vitality | +0.15m/s Sprint Speed +0.75% Ability Range +18 Souls per minute |
16 | +2.4m/s Sprint Speed +12% Ability Range +288 Souls per minute at max stacks |
 Mystic Regeneration |
800 | Spirit | 4HP/s Health Regeneration per stack | 6 | 24HP/s Health Regeneration at max stacks |
 Radiant Regeneration |
3,200 | Spirit | 4  x0.04HP/s Health Regeneration per stack |
6 | 24HP/s Health Regeneration at max stacks (before Spirit Scaling) |
 Escalating Exposure |
6,400 | Spirit | +4.5% Spirit Amp per stack | 12 | +54% Spirit Amp at max stacks |
Heroes with Stacking Effects
| Hero | Ability | Effect |
|---|---|---|
 Billy |
 Blasted |
Billy gains bonus health and increases Blasted duration for dealing melee attacks while Blasted |
 Celeste |
 Radiant Daggers |
Celeste gains increased spirit damage when the beam hits an enemy hero |
 Graves |
 Essence Theft (passive) |
Graves gradually steals Weapon Damage and Spirit Resist from shooting a target |
 Haze |
 Fixation (passive) |
Haze gains increased bullet damage to targets the more stacks they have |
 Kelvin |
 Arctic Beam |
Gradually applies increasing Movement and Fire Rate Slow on enemies |
 Lady Geist |
 Malice |
Causes targets to take increased damage from Lady Geist |
 Paradox |
 Pulse Grenade |
Applies stacking damage amp to targets, granting increased damage against them |
 Pocket |
 Barrage |
Gradually increases Pocket's overall damage as it hits targets |
 Shiv |
 Serrated Knives |
Increases the bleed's damage over time and refreshes its duration |
 Mirage |
 Djinn's Mark (passive) |
Builds up stacking spirit damage that can be triggered automatically or by Mirage |
 Mo & Krill |
 Scorn (T3) |
Applies stacking damage amp to targets, granting increased damage against them |
Heroes with Permanent Stack Bonuses
| Hero | Ability | Bonus per Stack | Max Stacks |
|---|---|---|---|
 Bebop |
 Sticky Bomb |
+2.5% bonus damage per enemy killed, +1% per enemy hurt | Infinite |
 Drifter |
 Bloodscent |
+3% Weapon Damage per isolation kill, +3% per assist | Infinite |
 Grey Talon |
 Guided Owl |
+8 Permanent Spirit Power per enemy killed | Infinite |
 Mina |
 Nox Nostra |
+1 bat released during Nox Nostra per  Love Bites trigger against heroes |
Infinite |
| Mo & Krill |
 Combo |
+40 Bonus Max Health per enemy killed during or within 3s of Combo ending | Infinite |
 Vindicta
|
 Assassinate
|
+6% weapon damage per enemy killed with or within 4s of being hit with Assassinate, increased to +10% with T3 upgrade | Infinite |
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