Our Velvet Merlin oatmeal stout has been transformed into a mindblowing mouthful know as Nitro Merlin Milk Stout. The new ingredient is lactose. When Velvet Merlin is brewed with milk sugar to create Nitro merlin Milk Stout the effect is similar to adding cream to your dark roasted coffee. The wizardry comes via "nitro," the brewing nickname for nitrogen gas.