It takes two years to brew this traditional sour ale. Like the best sour beer brewers of old, they age it in locally sourced Napa wine barrels. Heretic Brewing uses multiple strains of Brettanomyces (including one only found in the valley) and various local bacteria. This allows the beer to develop those funky flavors and sourness. They keep Agony balanced. It is never going to strip the enamel off your teeth or burn a hole in your stomach. Agony showcases Heretic Brewing's passion for traditional brewing techniques using locally grown and sourced fruits.