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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	+10% Weapon Damage per stack	6	+60% Weapon Damage at max stacks
Berserker	3,200	Weapon	+7% Weapon Damage per stack	10	+70% Weapon Damage at max stacks
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	-4% 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	+56% Fire Rate at max stacks
Spellslinger	6,400	Weapon	+10% 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	+20 Heal per stack x0.23	20	+400 Heal at max stacks (before Spirit Scaling)
Trophy Collector	3,200	Vitality	+25 Bonus Health +0.2m/s Sprint Speed +1% Ability Range +20 Souls per minute	14	+350 Bonus Health +2.8m/s Sprint Speed +14% Ability Range +280 Souls per minute at max stacks
Siphon Bullets	6,400	Vitality	65 Max HP steal per bullet	-	-
Mystic Regeneration	6,400	Spirit	4HP/s Health Regeneration per stackx.05	6	24HP/s Health Regeneration at max stacks (before Spirit Scaling)
Escalating Exposure	6,400	Spirit	+4% Spirit Amp per stack	14	+56% 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

• Haze's Fixation
  • Haze gains increased damage to targets the more stacks of Fixation they have.
• Kelvin's Arctic Beam
  • Arctic Beam gradually applies an increasing Movement and Fire Rate Slow on enemies.
• Lady Geist's Malice
  • Malice applies a bleed that causes targets to take increased damage from her, which can be stacked up to 5 times.
• Paradox's Pulse Grenade
  • Pulse Grenade's pulses each apply a stacking damage amp to targets, granting her increased damage against them.
• Pocket's Barrage
  • Barrage gradually increases Pocket's overall damage as it hits targets, up to 4 times per cast.
• Shiv's Serrated Knives
  • Each cast applies a stack of bleed, which increases the debuff's damage over time and refreshes its duration.
• Mirage's Djinn's Mark
  • Mirage's bullets apply a mark, stacking upon subsequent shots and allowing Mirage to detonate the stacks remotely, damaging all enemies marked based on their stacks.
• Mo & Krill's Scorn
  • T3 Combo applies a stacking damage amp to targets, granting Mo & Krill increased damage against them.

Heroes with Permanent Stack Bonuses

There are currently 3 Heroes capable of infinitely stacking during a round. In theory, they can continue to scale endlessly with no diminishing returns.

• Bebop's Sticky Bomb
  • Sticky Bomb gains 4% bonus damage for every enemy killed by Sticky Bomb and 1.5% for every enemy that was hurt by Sticky Bomb.
• Grey Talon's Guided Owl
  • Grey Talon gains 5 Permanent Spirit Power for every enemy killed by Guided Owl.
• Mo & Krill's Combo
  • Mo & Krill gain 50 Bonus Max Health for every enemy killed during or within 3 seconds of Combo ending.