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.
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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.
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 * 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.


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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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Works well with...

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