Viper

Agility ・ Ranged ・ Easy

Carry 1 Durable 2 Initiator 1 Disabler 1

Patch 7.41f 2026-09-15 released ・ Game data Client 6957(Oct 09 2026)

Stats

Attributes (base and gain per level)
  • Strength21 (+2.4/Lv)
  • Agility21 (+2.9/Lv)
  • Intelligence17 (+2/Lv)
Attack
  • Damage27–29
  • Base attack time1.7s
  • Base attack speed110
  • Attack range575
  • Attack point0.33s
  • Projectile speed1200
Defense and movement
  • Base armor-2
  • Magic resistance25%
  • Movement speed275
  • Turn rate0.6
  • Health regen0.25
  • Vision (day / night)1800 / 800

These are the base values written in the game files. Totals derived from attributes (HP, mana, armor) depend on engine-side formulas, so no estimated values are shown.

Recommended items

Items the in-game shop recommends for this hero (curated by Valve). These are not win-rate statistics.

Abilities

Poison Attack

Cooldown 0.0s Mana 20 Range 600 MAGICAL
ActiveCooldown0.0sMana20Range600

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.

Raw values (from the game files)(7)
DURATION 4
DAMAGE PER SECOND 4 / 8 / 12 / 16
MOVE SLOW 3 / 6 / 9 / 12
MAGIC RESISTANCE 4 / 6 / 8 / 10
MAX STACKS 6
bonus_range 25
RADIUS 0
Patch history
7.40 2025-12-15
  • Mana Cost decreased from 22 to 20

Nethertoxin

Cooldown 14.0s Mana 70 Range 900 MAGICAL
ActiveCooldown14.0sMana70Range900

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.

Raw values (from the game files)(7)
MIN DPS 15 / 25 / 35 / 45
MAX DPS 35 / 65 / 95 / 125
MAX DPS DURATION 4
RADIUS 400
ATTACK SPEED SLOW 30 / 40 / 50 / 60
DURATION 6.5 / 7 / 7.5 / 8
projectile_speed 2400
  • Multiple Nethertoxins do not stack.

Corrosive Skin Passive

MAGICAL
Passive

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.

Raw values (from the game files)(5)
DURATION 4.0
ATTACK SLOW 9 / 18 / 27 / 36
MAGIC RESISTANCE 10 / 15 / 20 / 25
DAMAGE PER SECOND 10 / 15 / 20 / 25
MAX RANGE RADIUS 1200
  • Stacks multiplicatively with other magic damage resistance sources.
  • Break prevents the application of Corrosive Skin. Does not disable Corrosive Skin application from Nosedive.
  • Damage done by this ability is considered reflected damage. Reflected damage does not provide any lifesteal and cannot be reflected.
Patch history
7.41 2026-03-24
  • Aghanim'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 Aghanim's Scepter
7.40c 2026-01-21
  • Damage per second rescaled from 8/16/24/32 to 10/15/20/25

Nosedive

Cooldown 25.0s Mana 75 Range 700 MAGICAL
ActiveCooldown25.0sMana75Range700

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.

Raw values (from the game files)(5)
RADIUS 500
duration 0.1
EFFECT DURATION 4
dive_speed 700
start_height 100
Patch history
7.41c 2026-05-06
  • Cooldown increased from 20s to 25s

Predator Innate Passive

PHYSICAL
Passive

Viper's attacks deal an additional instance of physical damage per missing health percentage of the target hero.

Raw values (from the game files)(1)
DAMAGE 0.25
Patch history
7.41 2026-03-24
  • Base Damage per Missing Health Percentage increased from 0.15 to 0.25

Viper Strike

Cooldown 50 / 40 / 30s Mana 100 / 150 / 200 Range 750 MAGICAL
ActiveCooldown50 / 40 / 30sMana100 / 150 / 200Range750

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.

Raw values (from the game files)(8)
DURATION 6
DAMAGE PER SECOND 70 / 110 / 150
MOVE SLOW 60 / 70 / 80
ATTACK SLOW 100 / 140 / 180
projectile_speed 1500
max_charges 2
charge_restore_time 30.0
does_break 1

Talents

Level 25 Nethertoxin Radius increases by 25 every 0.5s -50% Viper Strike Mana Cost / Cooldown
Level 20 +70 Viper Strike DPS +0.35 Predator Damage Per Missing Health
Level 15 +20/40 Nethertoxin Min/Max Damage +15% Poison Attack Slow / Damage
Level 10 +1s Viper Strike Duration +15 Corrosive Skin Damage Per Second

One of the two per level is chosen. They appear in the order registered in the game files.

Patch history (hero and talents)

7.41 2026-03-24
  • Agility gain increased from 2.7 to 2.9
  • Base Attack Speed decreased from 120 to 110
Talents
  • Level 10 Talent +10% Poison Attack slow/damage replaced with +15 Corrosive Skin Damage Per Second
  • Level 15 Talent +20 Corrosive Skin Damage Per Second replaced with +15% Poison Attack Slow / Damage
  • Level 15 Talent +30 Nethertoxin Min/Max Damage replaced with +20/40 Nethertoxin Min/Max Damage
  • Level 20 Talent Predator Damage Per Missing Health increased from +0.3 to +0.35
7.40c 2026-01-21
Talents
  • Level 20 Talent Predator Damage Per Missing Health increased from +0.25 to +0.3
  • Level 20 Talent Viper Strike DPS decreased from +80 to +70
7.40b 2025-12-23
Talents
  • Level 10 Talent +20 Corrosive Skin Damage Per Second replaced with +10% Poison Attack Slow/Damage
  • Level 15 Talent +15% Poison Attack Slow/Damage replaced with +20 Corrosive Skin Damage Per Second
  • Level 15 Talent Nethertoxin Min/Max Damage decreased from +40 to +30
7.40 2025-12-15
Talents
  • Level 20 Talent Predator Damage Per Missing Health increased from +0.2 to +0.25

Background

The 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.

Details

Internal namenpc_dota_hero_viper
Hero ID47
Aliases / search termsNetherdrake, Viper, ヴァイパー, う゛ぁいぱー, vaipa-, ネザードレイク, ねざーどれいく, neza-doreiku