The Witcher 3: Hearts of Stone - Viper Witcher Gear Set Location

Here are all the locations for the viper witcher gear set for the hearts of stone DLC this gear is better than all the rest. The first 4 diagrams (Armor,Boots,Gauntlets,Trousers) can be found in the quest called "Open Sesame!" In the auction house. You will have a chance to speak to people before you begin the bids. Talk to a lady named Countess Mignole and choose the second option to trade with her. Be sure to talk to her because these are miss able. The fifth diagram can be found in the same quest (open sesame!) inside the vault after you have killed everyone collect the deed to the house and look to your left. Look inside that chest and grab that diagram (Steel Sword). The sixth and last one can be found in the last quest "Whatsoever a man soweth...". Be sure to talk to Shani and do the optional side of this quest before meeting Olgierd or else you wont have the option to help Olgierd. Once you choose to help him you will get sent to a maze follow the video and it will lead you to the last witcher gear (Silver Sword). No diagram needed.