Agility · Ranged
Poisonous toxins chip away armor and slow enemies
Win rate
48.4%
C across all ranks
Pick rate
8.1%
of public matches
Public picks
273.2K
in the sample
Pro scene
12
48 bans · 58% win rate
Bars start at 50%. Sample sizes: Herald 11.8K · Guardian 31.4K · Crusader 48.8K · Archon 64.3K · Legend 64K · Ancient 32.3K · Divine+ 20.6K.
Last 6 days
48.6%
Bought before the horn
Iron Branch
Circlet
Tango
Faerie Fire
Observer Ward
The first minutes
Boots of Speed
Wraith Band
Power Treads
Null Talisman
Bracer
Blade of Alacrity
Core items
Hurricane Pike
Manta Style
Mage Slayer
The full build
Black King Bar
Eye of Skadi
Hurricane Pike
Manta Style
Linken's Sphere
Mystic Staff
Most-bought items for Viper in OpenDota’s sample of parsed public matches (1,721 purchases counted). Bars compare each item with the most-bought one in its phase. The percentage is the win rate in games where Viper bought the item by minute 30 (green or red when it is clearly above or below Viper’s average). Teams that are ahead buy items sooner, so a high number shows the item goes with winning games, not that it causes the win. Items with fewer than 100 games show no percentage. Cheap components are hidden from the mid and late game.
Perseverance
91 games
Dragon Lance
182 games
Boots of Travel
329 games
Blink Dagger
76 games
Boots of Travel
82 games
Dragon Lance
231 games
Aghanim's Shard
71 games
Aghanim's Scepter
61 games
Yasha
114 games
Aghanim's Shard
232 games
Ultimate Orb
101 games
Blink Dagger
71 games
Final items compared within the same purchase window (at least 60 games each), so they are not simply ranked by how late or expensive they are. Still a correlation: a team that is far ahead can buy anything sooner.
55
Use: Plant Tree: Targets the ground to plant a happy little tree that lasts for 20 seconds.
155
90
Use: Devour: Consumes a target tree to gain 7 health regeneration for 16 seconds. Consuming an Ironwood Tree doubles the heal duration. Comes with 3 charges.
65
Use: Imbue: Instantly restores 85 health.
5s
Use: Imbue. Instantly restores 85 health.
0
Use: Plant: Plants an Observer Ward, an invisible watcher that gives ground vision in a 1600 radius to your team. Lasts 6 minutes.
1s
Use: Plant. Plants an Observer Ward, an invisible watcher that gives ground vision in a 1600 radius to your team. Lasts 6 minutes. Hold Control to give one Observer Ward to an allied hero.
500
Movement speed bonuses from multiple pairs of boots do not stack.
505
1,400
Active: Switch Attribute: Switches between +10 Strength, +10 Agility, or +10 Intelligence. Movement speed bonuses from multiple pairs of boots do not stack.
Win rate when bought49.0% · 641 games
Active: Switch Attribute. Switches between +10 Strength, +10 Agility, or +10 Intelligence. Movement speed bonuses from multiple pairs of boots do not stack.
505
505
1,000
4,550
Active: Hurricane Thrust: Pushes you and target enemy 425 units away from each other, and for 5 seconds, allows you to make 5 attacks against the target without range…
Win rate when bought56.7% · 510 games
19s150
Active: Hurricane Thrust. Pushes you and target enemy 425 units away from each other, and for 5 seconds, allows you to make 5 attacks against the target without range restrictions and with +100 attack speed. Can be cast on self or allies to push the target 600 units in the direction it is facing. Enemy Range: 425
4,650
Active: Mirror Image: Creates 2 images of your hero that last 18 seconds. Melee images deal 33% damage, while Ranged images deal 25%. Illusions take 300% damage.
Win rate when bought61.3% · 266 games
34s125
Active: Mirror Image. Creates 2 images of your hero that last 18 seconds. Melee images deal 33% damage, while Ranged images deal 25%. Illusions take 300% damage. Dispel Type: Basic Dispel
3,100
Passive: Mage Slayer: Places a debuff when you attack enemies, dealing 35 physical damage per second and causing them to do 40% less spell damage for 3 seconds.
Win rate when bought56.5% · 161 games
4,050
Active: Avatar: Applies a basic dispel. Grants 60% magic resistance and immunity to reflected and pure damage.
Win rate when bought52.1% · 236 games
95s50
Active: Avatar. Applies a basic dispel. Grants 60% magic resistance and immunity to reflected and pure damage. For the duration of the effect, any negative effect from enemy spells has no effect. Duration: 9 / 8 / 7s Dispel Type: Basic Dispel
5,900
Passive: Cold Attack: Attacks lower enemy movement by -25% if they are melee and -50% if they are ranged.
Passive: Cold Attack. Attacks lower enemy movement by -25% if they are melee and -50% if they are ranged. Attacks also lower enemy attack speed by -25% and Health Restoration by 50%. Lasts for 3 seconds.
4,800
Passive: Spellblock: Blocks most targeted spells once every 14 seconds.
14s
Passive: Spellblock. Blocks most targeted spells once every 14 seconds.
Active: Transfer Spellblock. Temporarily removes Spellblock from the item's owner and transfers it to an allied unit for 14 seconds.
2,800
Intensifies Viper's venom, adding an effect to his normal attack that applies a stacking movement speed slow and magic resistance deduction while dealing damage over time. Stacks up to 6 times.
Aghanim’s ShardIncreases max stacks, and causes Poison Attack to lower armor per stack and to affect buildings for reduced damage.
Viper releases a Nethertoxin at the targeted area. Units in that area take an increasing damage over time based on how long they remain in it. Units in it have their attack speed slowed.
Viper exudes an infectious toxin that damages and slows the attack speed of any enemy that damages it in a 1200 radius. The acid exudate also increases Viper's resistance to magic.
Aghanim’s ScepterCorrosive Skin applies 4x the attack speed slow to enemies that are within 500 distance of Viper. Viper's Corrosive Skin Magic Resistance and Damage per Second are gradually increased while he is in Nethertoxin, up to 50% increased effect after 4s.
Viper slams into the ground, releasing a Nethertoxin and splattering each enemy in a 500 AoE for 4 seconds with the effect of Corrosive Skin.
Viper's attacks deal an additional instance of physical damage per missing health percentage of the target hero.
Viper slows the targeted enemy unit's movement and attack speed while also disabling their passives and dealing poison damage over time. The slowing effect reduces over the duration of the poison.
Nethertoxin Radius increases by 25 every 0.5s
25-50% Viper Strike Mana Cost / Cooldown
+70 Viper Strike DPS
20+0.35 Predator Damage Per Missing Health
+20/40 Nethertoxin Min/Max Damage
15+15% Poison Attack Slow / Damage
+1s Viper Strike Duration
10+15 Corrosive Skin Damage Per Second
Strength21+2.4/lvlAgility21+2.9/lvl
Intelligence17+2/lvlThe malevolent familiar of a sadistic wizard who captured and hoped to tame him, Viper was curiously glad to have been sprung from the sealed and unchanging subterranean Nether Reaches where his race had lived for millions of years, after tectonic slippage had sealed off the Netherdrakes in luminous caverns. Viper spent some time appearing to submit to the wizard's enchainments, hoping to learn what he could of the dark magics the mage practiced. But he soon realized that few spells were as deadly as the toxins that were his birthright. Exuding an acid that swiftly ate away the bars of his cage, the Netherdrake slipped free of his confines, spit poison in the old spellcaster's eyes, and soared out to let the world know that it had a new master.
Win rates come from public Dota 2 matches (OpenDota), 3.4M matches counted, refreshed Oct 24, 2026. Tiers use the win rate in the chosen rank: S 52.5%+, A 51%+, B 49%+, C 47.5%+, D below; heroes with too few games are left unrated. Hero data and patch notes are Valve’s. Builds Forge is an unofficial fan site, not affiliated with Valve.