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Viper portrait icon.png
Dragon icon.png Poisoner icon.png
Tier Four
One star icon.png Two star icon.png Three star icon.png
&&&&&&&&&&&&1100.&&&&&01,100 &&&&&&&&&&&&2200.&&&&&02,200 &&&&&&&&&&&&4400.&&&&&04,400
70 70 70
70 140 280
[60/80] [120/160] [240/320]
1.00 1.00 1.00
Move Speed
275 275 275
3 3 3
20 20 20
5 5 5

Viper is a Tier Four hero in Dota Underlords. Viper has Dragon Dragon ii.png and Poisoner Poisoner ii.png alliances.




Cooldown icon.png Cooldown: 6.0 seconds
Mana icon.png Mana Cost: 70 Mana
Damage icon.png Damage Type: Pure
Viper poisons a cell, dealing [100/150/225] damage per second to any enemy unit in it, Root icon.png rooting them and applying Break icon.png break.
Tread carefully Slark, trying to rob me won't end well for you - In which O'nia reveals her hired muscle
  • Lasts 5 seconds.
Corrosive Skin

Corrosive Skin

Damage icon.png Damage Type: Magical
Unlocked by the Dragon Dragon ii.png alliance bonus

Passive: Viper exudes an infectious toxin that applies a stack of Poison icon.png Poison and slows the attack speed by [20/30/40] of any enemy that damages it for 2 seconds. The acid exudate also increases Viper's magic resistance by [30/50/70].

I'd love to figure out a way to make a coat out of that one... - Carl, Big Dreams

Old Ability[]

Viper 3 Star Effect

Viper 3 Star Effect

At three stars, Viper performs a Viper Strike every 5 attacks. The enemy unit takes 250 damage per second and loses 80% move speed and 80 Attack Speed, with the slowing tapering off over the 3 second duration.
Viper Strike

Viper Strike

Cooldown icon.png Cooldown: 3.00 seconds
Mana icon.png Mana Cost: 100 Mana
Viper's acidic venom slows an enemy unit's movement and attack speed by [-40/-60/-80]% while also dealing [150/250/350] poison damage over time.

The slowing effect fades over the duration of the poison.

We're not that different... I too, know what it means to be a slave. - Quiet, Plotting Automaton
  • Viper Strike has a duration of 5 seconds.
    • The total damage is [750/1250/1750].


2-star equipment based on Fervid Monarch

3-star equipment based on Sign of the Netherfrost


Main article: Viper/Responses

Change logs[]

November 19, 2020 Patch
  • Maximum Health changed from [900, 1800, 3600] to [1100, 2200, 4400]

August 27, 2020 Patch

  • Tier changed from 3 to 4. Alliances changed from Dragon Dragon ii.png Assassin Assassins ii.png to Dragon Dragon ii.png Poisoner Poisoner ii.png.
  • Health changed from [825/1,650/4,500] to [900/1,800/3,600]
  • Attack Damage Minimum changed from [50, 100, 240] to [60, 120, 240]
  • Attack Damage Maximum changed from [60, 120, 360] to [80, 160, 320]

June 12, 2020 Patch

  • At three stars, Viper performs a Viper Strike every 5 attacks. The enemy unit takes 250 damage per second and loses 80% move speed and 80 Attack Speed, with the slowing tapering off over the 3 second duration.

February 25, 2020 Patch

  • Corrosive skin icon.png Corrosive Skin:
    • Instead of dealing damage over time, Corrosive Skin now applies a stack of Poison to Viper's attacker.

January 16, 2020 Patch

  • Nethertoxin icon.png Nethertoxin:
    • Damage changed from [100, 200, 300] to [100, 150, 225]

December 18, 2019 Patch

November 07, 2019 Patch

  • Nethertoxin icon.png Nethertoxin:
    • Damage changed from [50, 100, 150] to [100, 200, 300].

October 10, 2019 Patch

  • Max Mana is now 50.

October 02, 2019 Patch

July 12, 2019 Patch

  • Maximum Health changed from [550, 1100, 2200] to [550, 1100, 3000].
  • Attack Damage Minimum changed from [50, 100, 150] to [50, 100, 240].
  • Attack Damage Maximum changed from [60, 120, 240] to [60, 120, 360].

June 25, 2019 Patch

  • Dragon Dragon ii.png Alliance now unlocks Corrosive skin icon.png Corrosive Skin.
Tier One Anti-mage mini icon.png Anti-Mage  •  Batrider mini icon.png Batrider  •  Bounty hunter mini icon.png Bounty Hunter  •  Crystal maiden mini icon.png Crystal Maiden  •  Dazzle mini icon.png Dazzle  •  Drow ranger mini icon.png Drow Ranger  •  Enchantress mini icon.png Enchantress  •  Lich mini icon.png Lich  •  Magnus mini icon.png Magnus  •  Phantom assassin mini icon.png Phantom Assassin  •  Shadow demon mini icon.png Shadow Demon  •  Slardar mini icon.png Slardar  •  Snapfire mini icon.png Snapfire  •  Tusk mini icon.png Tusk  •  Vengeful spirit mini icon.png Vengeful Spirit  •  Venomancer mini icon.png Venomancer
Tier Two Bristleback mini icon.png Bristleback  •  Chaos knight mini icon.png Chaos Knight  •  Earth spirit mini icon.png Earth Spirit  •  Juggernaut mini icon.png Juggernaut  •  Kunkka mini icon.png Kunkka  •  Legion commander mini icon.png Legion Commander  •  Luna mini icon.png Luna  •  Meepo mini icon.png Meepo  •  Nature's prophet mini icon.png Nature's Prophet  •  Pudge mini icon.png Pudge  •  Queen of pain mini icon.png Queen of Pain  •  Spirit breaker mini icon.png Spirit Breaker  •  Storm spirit mini icon.png Storm Spirit  •  Windranger mini icon.png Windranger
Tier Three Abaddon mini icon.png Abaddon  •  Alchemist mini icon.png Alchemist  •  Beastmaster mini icon.png Beastmaster  •  Ember spirit mini icon.png Ember Spirit  •  Lifestealer mini icon.png Lifestealer  •  Lycan mini icon.png Lycan  •  Omniknight mini icon.png Omniknight  •  Puck mini icon.png Puck  •  Shadow shaman mini icon.png Shadow Shaman  •  Slark mini icon.png Slark  •  Spectre mini icon.png Spectre  •  Terrorblade mini icon.png Terrorblade  •  Treant protector mini icon.png Treant Protector
Tier Four Death prophet mini icon.png Death Prophet  •  Doom mini icon.png Doom  •  Lina mini icon.png Lina  •  Lone druid mini icon.png Lone Druid  •  Mirana mini icon.png Mirana  •  Pangolier mini icon.png Pangolier  •  Rubick mini icon.png Rubick  •  Sven mini icon.png Sven  •  Templar assassin mini icon.png Templar Assassin  •  Tidehunter mini icon.png Tidehunter  •  Viper mini icon.png Viper  •  Void spirit mini icon.png Void Spirit
Tier Five Axe mini icon.png Axe  •  Dragon knight mini icon.png Dragon Knight  •  Faceless void mini icon.png Faceless Void  •  Keeper of the light mini icon.png Keeper of the Light  •  Medusa mini icon.png Medusa  •  Troll warlord mini icon.png Troll Warlord  •  Wraith king mini icon.png Wraith King
Underlords Anessix mini icon.png Anessix  •  Enno mini icon.png Enno  •  Hobgen mini icon.png Hobgen  •  Jull mini icon.png Jull
Out of Season Arc warden mini icon.png Arc Warden  •  Bloodseeker mini icon.png Bloodseeker  •  Broodmother mini icon.png Broodmother  •  Clockwerk mini icon.png Clockwerk  •  Disruptor mini icon.png Disruptor  •  Enigma mini icon.png Enigma  •  Io mini icon.png Io  •  Gyrocopter mini icon.png Gyrocopter  •  Morphling mini icon.png Morphling  •  Necrophos mini icon.png Necrophos  •  Nyx assassin mini icon.png Nyx Assassin  •  Ogre magi mini icon.png Ogre Magi  •  Razor mini icon.png Razor  •  Shadow fiend mini icon.png Shadow Fiend  •  Sand king mini icon.png Sand King  •  Sniper mini icon.png Sniper  •  Techies mini icon.png Techies  •  Timbersaw mini icon.png Timbersaw  •  Tinker mini icon.png Tinker  •  Tiny mini icon.png Tiny  •  Warlock mini icon.png Warlock  •  Weaver mini icon.png Weaver  •  Witch doctor mini icon.png Witch Doctor