Viper/Counters

Bad against...
Viper primarily deals single-target damage and can get quickly overwhelmed by multiple Phantom Lancer illusions. Since is core on Phantom Lancer, it rapidly burns Viper's mana leaving him unable to cast  or. Also, since deals physical damage, it is not reduced by. High mobility of the Phantom Lancer will allow him engage and disengage indefinetly making Viper absolutely helpless.

Illusion heroes generally excel against Viper. After casting, Chaos Knight's high damage output can quickly kill Viper before he has a chance to deal any damage himself. Also, Viper has almost no way to deal with the Illusions.

The pure damage provided by is a great counter to Viper, as it is not reduced by. Additionally, prevents the slow and damage over time from both  and. Also can negate Viper's physical damage output.

Viper primarily deals single-tsarget damage and can get quickly overwhelmed by multiple Phantom Lancer illusions. Since is core on Phantom Lancer, it rapidly burns Viper's mana leaving him unable to cast  or. Also, since deals physical damage, it is not reduced by. High mobility of the Phantom Lancer will allow him engage and disengage indefinetly making Viper absolutely helpless. Viper is an agility hero, and his itembuild mostly include agility items, so can be devastating, removing all armor and vastly decreasing the effectiveness of, weakening Viper's magic resistance. Additionaly and  deal both magical and physical damage, and can help bringing Viper down fast.While being highly mobile hero, Windranger doesn't need to be afraid getting slowed by, as she can dodge it with. Additionaly can be easily landed on Viper as he is slow and have no abilities to disjoint it. grants Windranger vast amount of single target damage output, so she can cut through Viper's natural tankiness. And finaly is a great laning tool against Viper, as it helps Windranger staying away from  harass most of the time.
 * Note: Windranger's skills can be somewhat countered by Viper purchasing and  or  or.

Others

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Items

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Good against...
's damage reduction is extremely effective against Zeus because he deals magical damage almost exclusively. Zeus uses his spells for last hitting in the lane and takes constant damage from Corrosive Skin.
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 * Viper provides excellent damage over time to burn through charges with, , and.


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Others

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Works well with...

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List of heroes that counter Viper, and list of heroes that work well with Viper.