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DOTA 2 / HERO HISTORY

Viper changes

Balance notes across the versions listed by Valve. An unchanged patch is a small victory for your muscle memory.

Change record

37 patches with recorded changes · 118 of 118 listed patches readable.

Coverage: Feb 1, 2018 to Sep 15, 2026. This feed does not include every patch in Dota’s lifetime.

Inspect coverage by patch

Mar 24, 2026

Viper in 7.41

  • Agility gain increased from 2.7 to 2.9
  • Base Attack Speed decreased from 120 to 110
  • TalentsLevel 10 Talent +10% Poison Attack slow/damage replaced with +15 Corrosive Skin Damage Per Second
  • TalentsLevel 15 Talent +20 Corrosive Skin Damage Per Second replaced with +15% Poison Attack Slow / Damage
  • TalentsLevel 15 Talent +30 Nethertoxin Min/Max Damage replaced with +20/40 Nethertoxin Min/Max Damage
  • TalentsLevel 20 Talent Predator Damage Per Missing Health increased from +0.3 to +0.35
  • PredatorBase Damage per Missing Health Percentage increased from 0.15 to 0.25
  • Corrosive SkinAghanim's Scepter now also gradually increases Corrosive Skin's magic resistance and damage per second while he is in Nethertoxin, up to 50% increased effect after 4s

Jan 21, 2026

Viper in 7.40c

  • TalentsLevel 20 Talent Predator Damage Per Missing Health increased from +0.25 to +0.3
  • TalentsLevel 20 Talent Viper Strike DPS decreased from +80 to +70
  • Corrosive SkinDamage per second rescaled from 8/16/24/32 to 10/15/20/25

Dec 23, 2025

Viper in 7.40b

  • Caustic Bath · Corrosive SkinMax bonus effect decreased from 100% to 75%
  • TalentsLevel 10 Talent +20 Corrosive Skin Damage Per Second replaced with +10% Poison Attack Slow/Damage
  • TalentsLevel 15 Talent +15% Poison Attack Slow/Damage replaced with +20 Corrosive Skin Damage Per Second
  • TalentsLevel 15 Talent Nethertoxin Min/Max Damage decreased from +40 to +30

Dec 15, 2025

Viper in 7.40

  • Caustic Bath · Corrosive SkinTime to max effect increased from 4s to 5s
  • TalentsLevel 20 Talent Predator Damage Per Missing Health increased from +0.2 to +0.25
  • Poison AttackMana Cost decreased from 22 to 20

Oct 2, 2025

Viper in 7.39e

  • Corrosive SkinAttack Slow increased from 8/16/24/32 to 9/18/27/36

Aug 5, 2025

Viper in 7.39d

  • NethertoxinMin DPS increased from 15/20/25/30 to 15/25/35/45

May 22, 2025

Viper in 7.39

  • Poison AttackMana Cost decreased from 24 to 22
  • Viper StrikeAttack Slow increased from 80/120/160 to 100/140/180

Feb 18, 2025

Viper in 7.38

  • TalentsLevel 10 Talent +4% Poison Attack Magic Resistance Reduction replaced with +1s Viper Strike Duration
  • TalentsLevel 25 Talent Become Universal replaced with Nethertoxin Radius increases by 25 every 0.5s
  • NosediveNow also releases Nethertoxin upon landing
  • Nosedive · ContextMultiple Nethertoxins do not stack

Aug 14, 2024

Viper in 7.37b

  • TalentsLevel 15 Talent +20 Corrosive Skin Attack Speed Slow replaced with +15% Poison Attack slow/damage
  • TalentsLevel 20 Talent +20% Poison Attack slow/damage replaced with +0.2 Predator Damage per missing health
  • PredatorBonus damage is now decreased by the illusion damage reduction amount if applied by illusions
  • PredatorDamage per missing health decreased from 0.25 + 0.05 per Viper's level to 0.15 + 0.05 per Viper's level

Jul 31, 2024

Viper in 7.37

  • PredatorNew Innate ability. Passive, can't be leveled up
  • PredatorViper's attacks deal an additional instance of physical damage per missing health percentage of his target, equal to 0.25 + 0.05 per Viper's level. Only works on heroes
  • Corrosive SkinNo longer an innate ability
  • Corrosive SkinAttack Slow rescaled from 3/6/14/22/30 to 8/16/24/32
  • Corrosive SkinMagic Resistance rescaled from 5/10/15/20/25% to 10/15/20/25%
  • Corrosive SkinDamage per second rescaled from 3/6/14/22/30 to 8/16/24/32

Jun 6, 2024

Viper in 7.36b

  • Poison AttackMax Stacks increased from 5 to 6
  • NethertoxinProjectile Speed increased from 2000 to 2400

May 22, 2024

Viper in 7.36

  • Innate Ability · Corrosive SkinNow is an Innate ability. Passive, can be leveled up with skill points
  • Innate Ability · Corrosive SkinAttack Speed Slow rescaled from 8/16/24/32 to 3/6/14/22/30
  • Innate Ability · Corrosive SkinDamage per second rescaled from 8/16/24/32 to 3/6/14/22/30
  • Innate Ability · Corrosive SkinBonus Magic Resistance rescaled from 10/15/20/25% to 5/10/15/20/25%
  • Innate Ability · Corrosive SkinAghanim's Scepter no longer multiplies damage
  • Innate Ability · Corrosive SkinAghanim's Scepter Attack Slow Multiplier increased from 2x to 4x
  • Poison Burst · Poison AttackAfter the debuff expires, all enemies around the target in a 300 radius take damage equal to 100% of the magic damage dealt by Poison Attack
  • Caustic Bath · Corrosive SkinDamage per second and Magic Resistance are increased while Viper is in Nethertoxin's area of effect up to 100% after 4s
  • TalentsLevel 10 Talent Corrosive Skin Damage Per Second increased from +18 to +20
  • TalentsLevel 15 Talent +15% Corrosive Skin Magic Resistance replaced with +20 Corrosive Skin Attack Speed Slow
  • Poison AttackCast Range decreased from 600/640/680/720 to 600
  • NosediveNo longer Disarms
  • NosediveCorrosive Skin Splatter Radius decreased from 1200 to 500
  • NosediveCast Range increased from 475 to 700
  • NosediveDive Speed increased from 500 to 700

Feb 21, 2024

Viper in 7.35c

  • NethertoxinMax DPS decreased from 50/75/100/125 to 35/65/95/125
  • Corrosive SkinMax Range Radius decreased from 1400 to 1200

Dec 21, 2023

Viper in 7.35b

  • TalentsLevel 10 Talent Poison Attack Magic Resistance Reduction decreased from +5% to +4%
  • TalentsLevel 20 Talent Poison Attack slow/damage decreased from +25% to +20%
  • Poison AttackAghanim's Shard Max Stacks decreased from 8 to 7

Dec 14, 2023

Viper in 7.35

  • NethertoxinNo longer applies Break
  • NethertoxinNow slows attack speed by 30/40/50/60
  • Viper StrikeNow also applies Break
  • Viper StrikeMovement Slow increased from 40/60/80% to 60/70/80%
  • Viper StrikeCast Point improved from 0.3s to 0.2s

Aug 8, 2023

Viper in 7.34

  • TalentsLevel 25 Talent -11s Nethertoxin Cooldown replaced with Become Universal
  • Viper StrikeDuration increased from 5s to 6s
  • Viper StrikeInitial Attack Slow increased from 40/60/80 to 80/120/160
  • Viper StrikeDamage per second decreased from 80/120/160 to 70/110/150
  • Viper StrikeProjectile Speed increased from 1200 to 1500
  • NosediveCast Range increased from 375 to 475

Apr 20, 2023

Viper in 7.33

  • Viper StrikeCast Range increased from 500 to 700/800/900

Nov 29, 2022

Viper in 7.32d

  • TalentsLevel 10 Talent Corrosive Skin Damage per second increased from +13 to +18
  • TalentsLevel 15 Talent Corrosive Skin Magic Resistance increased from +12% to +15%
  • NethertoxinMana Cost decreased from 85 to 70
  • NosediveCast Range increased from 300 to 375

Sep 27, 2022

Viper in 7.32c

  • Poison AttackMovement Speed Slow per Stack decreased from 6/8/10/12% to 3/6/9/12%

Aug 23, 2022

Viper in 7.32

  • TalentsLevel 10 Talent +20 Attack Speed replaced with +5% Poison Attack Magic Resistance Reduction
  • TalentsLevel 15 Talent +300 Health replaced with +12% Corrosive Skin Magic Resistance Bonus
  • TalentsLevel 20 Talent +8% Poison Attack Magic Resistance Reduction replaced with +25% Poison Attack Damage/Slow
  • TalentsLevel 25 Talent 2x Corrosive Skin Slow/Attack replaced with -50% Viper Strike Cooldown/Mana Cost
  • Poison AttackMana Cost increased from 18/20/22/24 to 24
  • NethertoxinDuration decreased from 8s to 6.5/7/7.5/8s
  • Corrosive SkinScepter now doubles damage and slow for enemies within 500 distance from Viper. Additionally allows Corrosive Skin to deal the first instance of damage the moment debuff is applied
  • NosediveReworked Scepter. Grants Nosedive. Viper slams into the ground, disarming enemies in a 500 radius for 4 seconds, and splattering everyone in a 1200 area of effect with the effect of Corrosive Skin. Cooldown: 20s. Cast range: 300. Travel Speed: 500. Mana Cost: 75. Cast point: 0.3s

Feb 23, 2022

Viper in 7.31

  • TalentsLevel 10 Talent +8% Spell Lifesteal replaced with +13 Corrosive Skin Damage
  • TalentsLevel 15 Talent +70 Nethertoxin Max Damage replaced with +40 Nethertoxin Min/Max Damage
  • TalentsLevel 20 Talent +70 Attack Damage replaced with +8% Poison Attack Magic Resistance Reduction

Sep 10, 2021

Viper in 7.30c

  • Agility Gain increased from 2.5 to 2.7
  • Poison AttackMagic Resistance decrease per stack increased from 3/5/7/9% to 4/6/8/10%

Aug 17, 2021

Viper in 7.30

  • TalentsLevel 15 Talent +100 Attack Range replaced with +70 Nethertoxin Max Damage
  • Poison AttackMana Cost decreased from 20/22/24/26 to 18/20/22/24
  • NethertoxinMax damage reduced from 80/100/120/140 to 50/75/100/125

Apr 9, 2021

Viper in 7.29

  • TalentsLevel 25 Talent changed from Poison Attack Affects Buildings to 2x Corrosive Skin Slow and Resistance
  • TalentsLevel 15 Talent changed from +5 Corrosive Skin Stats to +300 Health
  • Poison AttackMana cost rescaled from 25 to 20/22/24/26
  • Poison AttackShard armor reduction reduced from 1.5 to 1
  • Poison AttackShard now also causes it to affect buildings for 40% poison damage.
  • Viper StrikeMana cost reduced from 125/175/225 to 100/150/200

Dec 21, 2020

Viper in 7.28a

  • Poison AttackShard max stack increase from +2 to +3

Jul 15, 2020

Viper in 7.27b

  • Base damage increased by 2
  • Intelligence increased from 15 + 1.8 to 17 + 2.0

May 2, 2020

Viper in 7.26c

  • NethertoxinMaximum dps increased from 60/80/100/120 to 80/100/120/140

Mar 17, 2020

Viper in 7.25

  • TalentsLevel 10 Talent increased from +8% Spell Lifesteal to +10%
  • Viper StrikeDamage increased from 60/100/145 to 80/120/160

Jan 6, 2020

Viper in 7.23f

  • Poison AttackManacost increased from 20 to 25

Jul 28, 2019

Viper in 7.22f

  • TalentsLevel 25 Talent increased from +120 Damage to +160

Jul 14, 2019

Viper in 7.22e

  • Base damage increased by 2
  • TalentsLevel 10 Talent increased from +20 Attack Speed to +25
  • TalentsLevel 15 Talent increased from +100 Attack Range to +125

Jun 30, 2019

Viper in 7.22d

  • Poison AttackDamage per missing health from 0.25/0.5/0.75/1 to 0.5/0.75/1/1.25

Mar 24, 2019

Viper in 7.21d

  • Agility gain reduced from 2.8 to 2.5
  • NethertoxinCooldown increased from 5 to 6

Mar 2, 2019

Viper in 7.21c

  • Agility gain reduced from 3.3 to 2.8
  • NethertoxinAoe damage no longer stacks with itself
  • NethertoxinManacost increased from 75 to 70/80/90/100
  • Poison AttackSlow reduced from 25/30/35/40% to 10/20/30/40%

Jan 29, 2019

Viper in 7.21

  • NethertoxinAoE increased from 350 to 380
  • NethertoxinDamage increased from 20/35/50/65 to 30/45/60/75

Nov 19, 2018

Viper in 7.20

  • NethertoxinAoE increased from 300 to 350
  • NethertoxinDamage rescaled from 20/30/40/50 to 20/35/50/65

Source: Valve’s public Dota 2 data feeds. Notes belong to Valve. Dates use Bellevue time (Pacific).