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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, Siphon Bullets and Restorative Locket are the only items to semi-permanently keep their stacks, and require certain conditions to lose them.

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	+ Bonus Health +0.15m/s Sprint Speed +0.75% Ability Range +18 Souls per minute	16	+400 Bonus Health +3.2m/s Sprint Speed +16% Ability Range +400 Souls per minute at max stacks
Siphon Bullets	6,400	Vitality	Max HP steal per bullet	-	-
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

While not stacking in a definition sense, Toxic Bullets and Spiritual Overflow have build up effects that stack over time by shooting enemy players.

Heroes with Stacking Effects

Hero	Ability	Effect
Celeste	Radiant Daggers	Celeste gains increased spirit damage when the beam hits an enemy hero
Haze	Fixation	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	Allows Mirage to detonate stacks remotely, damaging all enemies marked based on their stacks
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	+5% weapon damage per enemy killed, increased to +9% with T3 upgrade	Infinite