Viper's Sting is a medium armor set. When you deal damage with a melee attack, you deal an additional 6400 Poison Damage over 4 seconds. This effect can occur once every 4 seconds.
The Viper's Sting set is part of the base game. It drops in Fungal Grotto I and Fungal Grotto II in Stonefalls. Each set item is bound on pickup. You can acquire medium armor, weapons and jewelry of this set in the Argonian motif style.