[Source] The redanian Countess Mignole is a business acquaintance of dwarven banker Vimme Vivaldi, an avid collect of Vedyminaica, and a former flame of master witcher Vesemir. Geralt can meet her during an auction at the Borsodi Auction House in Oxenfurt in the Hearts of Stone expansion. She is also the only known source of Viper armor in the game.