Trial & Ale (x Omen) A Study of...A Study of Lactic Acid Bacterial Flavour Expression As Seen Through Historical Beer Styles; A. K. A. The Transformative Properties of Wild Fermentations on Oak. To date, all of our sour blends have comprised our pale sour base beer, which we have an extensive history of working with. The logical next step in our evolution was to strive for the perfect dark sour base beer to begin experimenting with. Logically, we rang up our friends at Omen Brewing