Template:Infoboxitem3Legendary Viper venomous steel sword is a craftable steel sword and is part of the Viper School Gear introduced in the Hearts of Stone expansion for The Witcher 3: Wild Hunt with the New Game + option.
The diagram can only be obtained during the Open Sesame! quest while inside the vault. It is located inside a chest near Maximilian Borsodi's house.Template:Craftingrequirements