Viper — Dota 2 hero guide

Viper is a ranged Agility hero played as Carry, Durable, Initiator, Disabler.

Abilities

• Poison Attack: 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.
• Nethertoxin: 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.
• Corrosive Skin: 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.
• Nosedive: 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.
• Predator:
• Viper Strike: 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.

Lore

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.

Hardest counters

Heroes with the best public-match win rate against Viper: Lone Druid, Windranger, Venomancer, Slardar, Techies. See the full counter list.