Armor of the Viper

Armor of the Viper is enchanted studded leather armor +5. It offers an basic armor class of 2 and the usual armor class modifiers which studded leather armor. The armor does give the wearer a +2 penalty against saving throws of poison and paralyzation. This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition. It's not known where this armor can be acquired.

In-game description
"This armor's namesake is a serpent only in manner, referring to the Drow assassin Raroh.  Poison was his trademark, and when he discovered this suit's susceptibility to venom, he gifted it to Avlorm, a promising novice assassin within his own guild.  When Avlorm's power eventually threatened his own, Raroh easily dispatched him, thanks to the weakness of the armor he still wore."