Buy Blackened X Willet Masters of Whiskey Series Online. BLACKENED® American Whiskey launches its first-ever collaboration as part of the Limited Edition Masters of Whiskey Series: The BLACKENED X Willett Collaboration Kentucky Straight Rye.This Limited Edition Kentucky Straight Rye highlights the symbiotic collaboration between Master Distiller & Blender Rob Dietrich of Sweet Amber Distilling Co. and Master Distiller Drew Kulsveen of Willett Distillery, Bardstown, KY.