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▶️ Many hands make light work.
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Bad against...[edit]

Broodmother icon.png
  • Viper's lack of escape and durability means he can be ran over in a laning stage by Spiderlings.
  • Broodmother can bring Viper down quickly with Insatiable Hunger activated.
Chaos Knight icon.png
  • Viper has no response to the standard initiation combo of Reality Rift into Chaos Bolt.
  • Phantasm can eliminate Viper almost instantly with its damage output.
Clinkz icon.png
Invoker icon.png
Lifestealer icon.png
  • Rage ignores all of Viper's magical damage.
  • Feast and Open Wounds combine to heal through Viper's physical damage.
Phantom Lancer icon.png
  • Phantom Lancer can overwhelm Viper with spawned illusions from Spirit Lance and Doppelganger.
  • Viper's various slows do not work against Phantom Rush. Additionally, it is almost impossible to keep Lancer inside Nethertoxin's radius in order to disable the passive.
Pugna icon.png
  • Pugna's Decrepify allows him to save allies from being ganked by Viper, since Viper mostly relies on direct attacks in order to deal damage.
  • Nether Ward can discourage Viper from spamming his abilities.
  • Viper's damage over time is not enough to kill Pugna as he will have more than enough time to save himself (or his allies) with Life Drain and Viper has no solutions to cancel it.
  • Pugna has no passive abilities, which renders Nethertoxin nearly useless.
Rubick icon.png
  • If Rubick can use Spell Steal to take Nethertoxin, he will be able to disable Corrosive Skin, reducing much of Viper's durability.
  • He can also steal Viper Strike, which can be used to hinder a hero on your team (or multiple heroes, if Rubick has Aghanim's Scepter icon.png Aghanim's Scepter).
Terrorblade icon.png
  • Viper's damage over time and lack of disables makes him easy to Sunder.
  • Viper's physical damage is mitigated by Terrorblade's high armor.
  • Terrorblade under Metamorphosis can quickly kill Viper with heavy physical damage.
Weaver icon.png
  • Shukuchi ignores slows and allows Weaver to escape Viper's onslaught.
  • Time Lapse dispels Poison Attack and Corrosive Skin and undoes poison damage.
  • Weaver's high burst damage allows him to kill Viper before being killed.
Windranger icon.png
  • Windrun evades Poison Attack and counteracts the slow.
  • Viper's low mobility makes him an easy Shackleshot target.
  • Focus Fire grants Windranger significant physical damage output to quickly wear Viper down.
  • Powershot is a strong harassment and zoning tool against Viper in lane.
Wraith King icon.png
  • Viper's Nethertoxin cannot disable Reincarnation, which could put him in disadvantage against Wraith King if his whole team is with him.
  • In addition, Viper doesn't like buying Diffusal Blade 1 icon.png Diffusal Blade, which is the only item that can help him against Wraith King.



  • Town Portal Scroll icon.png Town Portal Scroll allows heroes to escape from Viper, as he cannot interrupt it nor kill a healthy hero before they teleport.
  • Black King Bar icon.png Black King Bar nullifies most of Viper's arsenal.
  • Blink Dagger icon.png Blink Dagger can be used to take advantage of Viper's low mobility, but his damage over time makes it unreliable as an escape tool.
  • Ghost Scepter icon.png Ghost Scepter and Ethereal Blade icon.png Ethereal Blade protect against Viper's attacks.
  • Glimmer Cape icon.png Glimmer Cape's invisibility prevents Viper from attacking the target, and the magic resistance counteracts Viper's damage over time.
  • Force Staff icon.png Force Staff can allow a hero to escape while slowed by Viper.
  • Silver Edge icon.png Silver Edge's break disables Corrosive Skin, making him weaker even against the heroes he naturally counters.
  • Manta Style icon.png Manta Style disjoints Viper Strike and can make Viper waste time attacking illusions.
  • Diffusal Blade 1 icon.png Diffusal Blade can slow Viper with its active ability and pin him down while burning his mana.
  • Necronomicon 1 icon.png Necronomicon summons are difficult for Viper to fight against and burn his mana.
  • Linken's Sphere icon.png Linken's Sphere blocks Viper Strike, and Viper has no other ways to break the Spell Block. In addition, Viper hates buying disabling items.
  • Lotus Orb icon.png Lotus Orb can reflect Viper Strike.

Good against...[edit]

Abaddon icon.png
Axe icon.png
  • Nethertoxin prevents Counter Helix from triggering, which significantly lowers Axe's damage output in the early to mid game.
  • Viper's various slows and damage over time prevents Axe from initiating as well as putting his Blink Dagger icon.png Blink Dagger on cooldown.
Bristleback icon.png
  • Nethertoxin's break removes Bristleback and prevents Warpath from building stacks. Besides losing his eponymous defensive passive, Bristleback also lose his ability to build up damage over lengthy battles.
  • Viper can perpetually kite Bristleback with Poison Attack and Viper Strike.
Dragon Knight icon.png
  • Dragon Knight is easily harassed by Poison Attack after the laning stage ends.
  • Corrosive Skin protects Viper from Breathe Fire and returns damage.
  • Nethertoxin mitigates Dragon Blood, Dragon's Knight main source of armor and health regeneration.
  • Between Poison Attack and Viper Strike, Viper can keep Dragon Knight permanently slowed even in Elder Dragon Form.
Earthshaker icon.png
  • Being a melee hero, Earthshaker's movement is liable to suppression by Poison Attack and Viper Strike.
  • Earthshaker's kit, with the exception of Enchant Totem, deals magic damage. Corrosive Skin effectively blunts his killing potential with a standard Blink combo among other things.
  • Nethertoxin disables Aftershock, which removes the stun and bonus damage from Enchant Totem and Echo Slam. Additionally the level 25 talent will silence Earthshaker, making him vulnerable to Viper's teammates without stuns.
Huskar icon.png
  • Nethertoxin disables Berserker's Blood, which Huskar relies upon for attack speed and healing.
  • The damage from Burning Spear and Life Break is largely absorbed by Corrosive Skin. It also will return some damage, making it risky to use Burning Spears in the laning stage.
  • Because Huskar wants to be on low health for Berserker's Blood, he is particularly vulnerable to Poison Attack.
Magnus icon.png
  • Most of Magnus' abilities except Empower will trigger damage through Corrosive Skin.
  • Poison Attack and Viper Strike can slow Magnus during Skewer, as well as putting his Blink Dagger icon.png Blink Dagger on cooldown, preventing him from initiating or re-initiating.
Mars icon.png
  • Nethertoxin breaks Bulwark entirely, making Mars far less tanky. Using Nethertoxin inside Arena Of Blood may discourage enemies from following up with Mars' initiation.
  • Rod of Atos icon.png Rod of Atos is currently common on Viper and keeps Mars in position long enough to be killed.
  • Viper is not very tanky earlier in the game, so positioning against Mars is important since a well-timed Spear of Mars can be the end of Viper.
Monkey King icon.png
  • Nethertoxin prevents the buildup of Jingu Mastery stacks.
  • Monkey King's high base movement speed is of little worth against the array of slows Viper possesses.
  • All of Viper's magical damage over time stops Monkey King from using Tree Dance. It also ignores the extra armor bestowed by Wukong's Command.
Necrophos icon.png
Nyx Assassin icon.png
Phantom Assassin icon.png
  • Nethertoxin disables Blur and Coup de Grace
  • Phantom Assassin's somewhat frail health makes her vulnerable to Viper's magical attacks.
Razor icon.png
  • Storm Surge is counteracted by Nethertoxin, leaving Razor without faster MS.
  • Static Link's damage drain doesn't bother Viper a lot as most of his early to mid game damage is magical.
Slark icon.png
  • Nethertoxin negates Essence Shift and the regeneration aspect of Shadow Dance.
  • Dark Pact doesn't mean a lot against Viper's ubiquitous slows.
  • Viper becomes a relevant presence in team fights before Slark can procure his standard items (e.g. Shadow Blade icon.png Shadow Blade).
Spectre icon.png
  • Nethertoxin disables Desolate and Dispersion, leaving Spectre with far less damage output and damage mitigation in engagements.
  • Spectre is one of the weakest heroes at early levels. Viper can stifle her farm with early fights before Spectre purchases any major items.
Templar Assassin icon.png
  • All of Viper's abilities quickly burn through Refraction charges.
  • Templar Assassin's short range, aside from Psi Blades' spill damage, makes her vulnerable to Poison Attack harassment.
  • Templar Assassin traditionally forgoes health and armor items for damage. Outside of Black King Bar icon.png Black King Bar, Viper will almost always be able to kill her when Refraction is down.
Tidehunter icon.png
  • Nethertoxin cancels out Kraken Shell and stops the hard dispel from passively activating, preventing Tidehunter from functioning as a frontline tank.
  • Anchor Smash is mostly irrelevant against a ranged hero.
  • Tidehunter relies on the threat of Ravage, which has an obscenely long cooldown. Viper can exploit the downtime with his short cooldowns.
Vengeful Spirit icon.png
Venomancer icon.png
  • Corrosive Skin means Viper can often outlast Venomancer in a battle of attrition.
  • Venomancer has no mobility without items, which makes him vulnerable to constant slows.
Visage icon.png
  • Nethertoxin cuts off Gravekeeper's Cloak, Visage's primary defense mechanism.
  • Viper can ignore Grave Chill's attack speed slow with his magic damage output.
Zeus icon.png
  • Corrosive Skin severely reduces Zeus's damage output throughout the game.
  • During the laning stage, Viper can abuse Zeus' reliance on spells by hugging the creep wave. Zeus will take constant damage over time from Corrosive Skin unless he drives Viper from the lane or returns to farming in his absence.
  • Prior to buying Blink Dagger icon.png Blink Dagger or Force Staff icon.png Force Staff, Zeus is fragile and possesses low mobility. Any of Viper's numerous slows can set up an easy kill.


Works well with...[edit]

Abaddon icon.png
Beastmaster icon.png
  • Beastmaster by nature expediently pushes towers with maximum points in Inner Beast and Call of the Wild Boar. The aura boosts Viper's DPS while the boars contribute additional slows to assist Poison Attack.
  • Primal Roar solves Viper's lack of disables that pierce spell immunity.
Clockwerk icon.png
  • Hookshot into Power Cogs, combined with Nethertoxin, equals death for many opponents: the magic resistance reduction empowers Battery Assault while Cogs isolate heroes for Viper to focus.
  • Clockwerk only needs levels to begin rotating for ganks and 1-2 items to significantly contribute to team fights. This ramp-up aligns with Viper's power curve.
Crystal Maiden icon.png
  • Arcane Aura grants the necessary mana regeneration for Viper to use Poison Attack in the lane. Unlike Keeper of the Light minimap icon.png Keeper of the Light she does not have to rotate to help him in this regard.
  • Crystal Maiden is very slow with low health. Viper acts as a distraction with his innate tankiness so she can get off her spells without interruption, especially Freezing Field.
Dark Seer icon.png
  • Ion Shell heavily punishes melee opponents that attempt to kill Viper with standard attacks instead of magic damage. It also pushes out the side lanes quickly, a task Viper needs others to perform.
  • Surge is one of the best abilities to boost Viper's low base movement speed.
Dazzle icon.png
  • Poison Touch in practice is an intuitive combination with Poison Attack. Even if the target runs away, it is easy to refresh its duration by throwing out Poison Attack and Nethertoxin. This is particularly strong in the early stages of the game.
  • Shallow Grave and Shadow Wave can save Viper in dangerous spots while he continues to wear down his opponents.
  • Bad Juju steadily decreases enemy armor throughout long battles, the type of scuffles Viper excels in.
Drow Ranger icon.png
  • Precision Aura greatly increases Viper's attack speed, making his laning phase even stronger.
  • Gust and Frost Arrows combined with Viper's slows make it difficult for an enemy to escape.
  • Nethertoxin eliminates the defenses of several heroes that Drow Ranger struggles to kill.
  • Corrosive Skin makes Viper tanky so he can shield Drow Ranger, who prefers to output damage from the backline.
Earth Spirit icon.png
  • Between Boulder Smash, Rolling Boulder and Geomagnetic Grip, the hero is proficient at setting up kills in the midgame. Viper and Earth Spirit become a potent ganking duo that can secure map control.
  • Earth Spirit is one of the best supports for ganking the midlane. He can secure Viper an advantage before level 5, a period when the hero is traditionally mediocre.
  • Magnetize contributes strong area-of-effect damage over time, setting up Poison Attack's inverse scaling.
  • Earth Spirit doesn't need Viper to position himself in a defensive manner; he has such high health that he takes the initiative and willingly barrels into fights.
Faceless Void icon.png
  • Chronosphere provides easy targets for Viper to pick off from a distance.
  • When used in the middle of a team fight, Time Dilation halts the cooldown of disables that are troublesome for Viper to deal with.
  • Nethertoxin's break mechanic makes many heroes that Faceless Void struggles to kill much easier to take down.
  • Viper creates space for Faceless Void to farm up lategame items since the former is a potent threat so early in the game.
Lich icon.png
  • Frost Shield protects Viper from the majority of damage thrown his way. Additionally, it sets up counterattacks by slowing and damaging nearby enemies.
  • Sinister Gaze locks fleeing opponents in place, ensuring they can't run away from the slow carry.
  • Chain Frost is a powerful deterrent against teams that aim to dogpile Viper and kill him before the fight extends too long.
  • Lich has no escape abilities, making him vulnerable if exposed in team fights. Viper draws attention away from him, enabling Lich to use all his abilities without interruption.
Luna icon.png
  • Level 4 Lunar Blessing turns Viper into an intimidating tower pusher when combined with inexpensive items like Dragon Lance icon.png Dragon Lance, Helm of the Dominator icon.png Helm of the Dominator, and Drum of Endurance icon.png Drum of Endurance.
  • As a hero oriented towards early and midgame battles, Viper makes space on the map for Luna to farm the expensive stats items that make her powerful.
  • Luna can split-push with Manta Style icon.png Manta Style, ameliorating Viper's lack of movement speed.
Necrophos icon.png
  • Heartstopper Aura whittles down enemy health over time, making them more susceptible to Poison Attack.
  • Death Pulse replenishes Viper's health in small amounts. It can be repeatedly used in fights to save him from certain death.
  • Like Viper, Necrophos hits his first power peak soon after the laning phase ends.
  • Necrophos frequently buys items that synergize with Viper's abilities, except they are either obnoxiously expensive or lose effectiveness too quickly to be prudent on the hero itself. These include Radiance (Active) icon.png Radiance, Veil of Discord icon.png Veil of Discord, and Guardian Greaves icon.png Guardian Greaves.
Ogre Magi icon.png
  • Preemptive Bloodlust accelerates Viper's farm, doubly so if he buys Maelstrom icon.png Maelstrom.
  • Ignite as well as Ogre Magi's high base attributes and armor help secure the lane for Viper early on.
Slardar icon.png
  • Slithereen Crush interrupts channeling abilities and can lock down a target for Viper to kill.
  • Corrosive Haze massively increases Viper's single-target damage.
  • Both Viper and Slardar fight at the same pace. They possess low cooldown spells and the tankiness to use them several times in a fight.
Treant Protector icon.png
  • Living Armor protects Viper in lane without the need for rotations. Combined with Corrosive Skin, Viper becomes almost impossible to gank.
  • Overgrowth locks opponents in place for Viper to attack them.