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Damage Resistance refers to the Bullet and Spirit Resist statistics which reduce incoming damage taken.

Bullet Resist reduces all weapon (such as bullets/melee) damage, while Spirit Resist reduces all spirit damage.

Notes

Resistances can go negative, and this multiplies the damage taken of that type.

30% resist= 70% of the damage from the weapon or ability.

0% resist = 100% of the damage from the weapon or ability.

-30% resist = 130% of the damage from the weapon or ability.

Items like Headshot Booster grant a flat added bullet damage, this bonus damage is not multiplied by weapon damage but is subject to resistance reduction/increase in damage.

Even Resistance from Level#Power Increases is multiplicative. For example, Bebop's base Resistance is 0%, while he gains 1.25% Resist per Power Increase. After 14 Power Increases, Bebop's total resistance will be $0.1 + 1 - (1 - 0.0125)^{14} = 26.2 %$

Math

Despite being presented in-game as +X% Bullet Resist, multiple sources of bullet resist stack multiplicatively, not additively.

The formula for bullet resist is: $B R_{f} = ⌈ 1 - \prod_{i = 1}^{n} (1 - B R_{i}) ⌉$
where:
$\begin{matrix} B R_{f} & = final bullet resist, \\ n & = number of bullet resist sources, \\ B R_{n} & = bullet resist value \end{matrix}$

For example, multiple sources of Bullet Resist:

60% Bullet Resist from Viscous' Goo Ball
40% Bullet Resist from the Colossus Item results in:

$1 - (1 - 0.6) * (1 - 0.4) = 76 % Bullet Resist$

Resistance Reduction

Resistance Reduction refers to any negative amount of Resist, making the target take increased damage.

Resistance Reduction is calculated multiplicatively like resistance, but then simply subtracted from the resistance amount.

$𝐷 𝑖 𝑠 𝑝 𝑙 𝑎 𝑦 𝑒 𝑑 𝑅 𝑒 𝑠 𝑖 𝑠 𝑡 = [1 - (1 - 𝑅 𝑒 𝑠 𝑖 𝑠 𝑡 𝑎 𝑛 𝑐 𝑒 1) * (1 - 𝑅 𝑒 𝑠 𝑖 𝑠 𝑡 𝑎 𝑛 𝑐 𝑒 2) * ... * (1 - 𝑅 𝑒 𝑠 𝑖 𝑠 𝑡 𝑎 𝑛 𝑐 𝑒 𝑁)] - [1 - (1 - 𝑅 𝑒 𝑠 𝑅 𝑒 𝑑 𝑢 𝑐 𝑡 .1) * (1 - 𝑅 𝑒 𝑠 𝑅 𝑒 𝑑 𝑢 𝑐 𝑡 .2) * ... * (1 - 𝑅 𝑒 𝑠 𝑅 𝑒 𝑑 𝑢 𝑐 𝑡 . 𝑁)]$

For example, using Bullet Resists and Reductions:

70% Spirit Resist from Viscous' Goo Ball
20% Spirit Resist from Spirit Armor
-12% Spirit Resist from Spirit Strike
-12% Spirit Resist from Mystic Vulnerability
-24% Spirit Resist from Crippling Headshot

$[1 - (1 - 0.7) * (1 - 0.2)] - [1 - (1 - 0.12) * (1 - 0.12) * (1 - 0.24)] = 35 % S p i r i t R e s i s t$

Graphs

“Alright buddy, give 'em hell!”

This page is under construction. To avoid edit conflicts, please consult the edit history and the talk page.

Include graph of effective health as a function of Damage Reduction. In the mean time, feel free to refer to this Desmos graph.

Include graph of effective damage increase from using 15%, 30%, and 45% Resistance Reduction as a function of the target's original Damage Reduction. In the mean time, feel free to refer to this Desmos graph.

Sources of Damage Resistance

Bullet Resist

This is a dynamic list "Bullet Resist". Edit contents.


Name	Cost	Category	Stat change
Fleetfoot	1,600	Weapon	+6% Bullet Resist
Melee Charge	1,600	Weapon	+6% Bullet Resist
Berserker	3,200	Weapon	+8% Bullet Resist
Escalating Resilience	3,200	Weapon	+2% Bullet Resist
Heroic Aura	3,200	Weapon	+17% Bullet Resist
Crushing Fists	6,400	Weapon	+12% Bullet Resist
Battle Vest	1,600	Vitality	+18% Bullet Resist
Return Fire	1,600	Vitality	+10% Bullet Resist
Weapon Shielding	1,600	Vitality	+18% Bullet Resist
Bullet Resilience	3,200	Vitality	+30% Bullet Resist
Metal Skin	3,200	Vitality	+12% Bullet Resist
Warp Stone	3,200	Vitality	+30% Bullet Resist
Cheat Death	6,400	Vitality	+15% Bullet Resist
Indomitable	6,400	Vitality	+10% Bullet Resist
Siphon Bullets	6,400	Vitality	+10% Bullet Resist
Vampiric Burst	6,400	Vitality	+10% Bullet Resist
Bullet Resist Shredder	1,600	Spirit	+9% Bullet Resist
Suppressor	1,600	Spirit	+8% Bullet Resist
Superior Duration	3,200	Spirit	+8% Bullet Resist
Echo Shard	6,400	Spirit	+5% Bullet Resist

Monster Rounds increases Bullet Resist vs. NPCs by +30%.
Escalating Resilience increases Bullet Resist by 2% per stack per shot when hitting enemy heroes, maxing at 40% Bullet Resist.

Bullet Resist Reduction

This is a dynamic list "Bullet Resist Reduction". Edit contents.


Name	Cost	Category	Stat change
Stalker	1,600	Weapon	-6% Bullet Resist Reduction
Weakening Headshot	1,600	Weapon	-13% Bullet Resist Reduction
Alchemical Fire	3,200	Weapon	-7% Bullet Resist Reduction
Hollow Point	3,200	Weapon	-9% Bullet Resist Reduction
Hunter's Aura	3,200	Weapon	-10% Bullet Resist Reduction
Crippling Headshot	6,400	Weapon	-16% Bullet Resist Reduction
Crushing Fists	6,400	Weapon	-5% Bullet Resist Reduction
Rusted Barrel	800	Spirit	-8% Bullet Resist Reduction
Bullet Resist Shredder	1,600	Spirit	-10% Bullet Resist Reduction
Disarming Hex	3,200	Spirit	-13% Bullet Resist Reduction

Spirit Resist

This is a dynamic list "Spirit Resist". Edit contents.


Name	Cost	Category	Stat change
Blood Tribute	3,200	Weapon	+8% Spirit Resist
Silencer	6,400	Weapon	+12% Spirit Resist
Enchanter's Emblem	1,600	Vitality	+18% Spirit Resist
Restorative Locket	1,600	Vitality	+8% Spirit Resist
Spirit Shielding	1,600	Vitality	+18% Spirit Resist
Dispel Magic	3,200	Vitality	+10% Spirit Resist
Fury Trance	3,200	Vitality	+40% Spirit Resist
Spirit Resilience	3,200	Vitality	+30% Spirit Resist
Healing Tempo	6,400	Vitality	+10% Spirit Resist
Indomitable	6,400	Vitality	+10% Spirit Resist
Infuser	6,400	Vitality	+10% Spirit Resist
Spellbreaker	6,400	Vitality	+18% Spirit Resist
Witchmail	6,400	Vitality	+22% Spirit Resist
Cold Front	1,600	Spirit	+6% Spirit Resist
Mystic Vulnerability	1,600	Spirit	+8% Spirit Resist
Greater Expansion	3,200	Spirit	+10% Spirit Resist
Arctic Blast	6,400	Spirit	+10% Spirit Resist
Echo Shard	6,400	Spirit	+5% Spirit Resist
Escalating Exposure	6,400	Spirit	+17% Spirit Resist
Ethereal Shift	6,400	Spirit	+30% Spirit Resist
Scourge	6,400	Spirit	+40% Spirit Resist

Spirit Resist Reduction

This is a dynamic list "Spirit Resist Reduction". Edit contents.


Name	Cost	Category	Stat change
Spirit Shredder Bullets	1,600	Weapon	-8% Spirit Resist Reduction
Spirit Rend	3,200	Weapon	-8% Spirit Resist Reduction
Spirit Rend	3,200	Weapon	-7% Spirit Resist Reduction
Crippling Headshot	6,400	Weapon	-16% Spirit Resist Reduction
Spirit Strike	800	Spirit	-6% Spirit Resist Reduction
Mystic Vulnerability	1,600	Spirit	-8% Spirit Resist Reduction
Spirit Sap	1,600	Spirit	-9% Spirit Resist Reduction
Spirit Snatch	3,200	Spirit	-12% Spirit Resist Reduction
Escalating Exposure	6,400	Spirit	-8% Spirit Resist Reduction
Focus Lens	6,400	Spirit	-9% Spirit Resist Reduction