Viper

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.

Carry
Durable
Poison Attack
Unit Target Enemies Physical

Intensifies Viper's venom, adding an effect to his normal attack that slows attack and movement speed while dealing damage over time. Poison Attack is a Unique Attack Modifier, and does not stack with other Unique Attack Modifiers.

Duration: 2

Damage Per Second: 10/16/22/28

Move Slow: 10%/20%/30%/40%

Attack Slow: 10/20/30/40

Successive casts don't increase slow or damage, but refresh the duration.

Nethertoxin
Passive Magical

Nethertoxin causes Viper's normal attack to deal bonus damage to units based on how much health they are missing. The bonus damage doubles for each 20% of health missing from the target. Nethertoxin deals half damage to creeps and buildings.

Base Bonus Damage: 2.5/5/7.5/10

Non-hero Damage: 50%

Max Bonus Damage: 40/80/120/160

Corrosive Skin
Passive Physical

Viper exudes an infectious toxin that damages and slows any enemy that damages it in a 1400 radius. The acid exudate also increases Viper's resistance to magic.

Duration: 4

Move Slow: 10%/15%/20%/25%

Attack Slow: 10/15/20/25

Magic Resistance: 10%/15%/20%/25%

Damage Per Second: 10/15/20/25

Max Range Radius: 1400

Stacks multiplicatively with other magic damage resistance sources.

Viper Strike
Unit Target Enemies Physical

Viper slows the targeted enemy unit's movement and attack speed while also dealing poison damage over time. The slowing effect reduces over the duration of the poison. Upgradable by Aghanim's Scepter.

Duration: 5.1

Damage Per Second: 60/100/145

Move Slow: 40%/60%/80%

Attack Slow: 40/60/80

Scepter Mana Cost: 125

Scepter Cooldown: 12

Scepter Cast Range: 900

Slow works on spell immune units.

Units afflicted by Viper Strike can be denied when their HP drops below 25%.

Viper

20 + 1.9 21 + 2.5 15 + 1.8
Level Base 1 25
Health 150 530 1396
Health Regen 0.25 0.9 2.2
Mana 0 195 757
Mana Regen 0.01 0.3 1.2
Armor -1 2.0 10.6
Attack Rate 1.7 1.40 0.94

Damage

Level Min Avg Max
Base 23 24 25
1 44 45 46
25 104 105 106

Misc

Magic Resistance 25
Attack Range 575
Projectile Speed 1200
Movement Speed 285
Turn Rate 0.4
Day Vision 1800
Night Vision 800
Hero Radius 70