Firestone Walker Brewing Co. has made some significant changes to Velvet Merlin, turning it into a brand new beer.

The Paso Robles, Calif.-based brewery took its popular Velvet Merlin oatmeal stout (5.5 percent ABV) and made two changes: it added non-fermentable lactose sugar—or milk sugar, as it is more commonly known—which essentially turned it into a milk stout, then nitrogenated the beer instead of using the more common CO2.

Firestone Walker Nitro Merlin Milk Stout wide

“We’ve experimented with Velvet Merlin as both a milk stout and as a nitro beer, but this is the first time we’ve married the two styles,” said Matt Brynildson, brewmaster at Firestone Walker. “The combination is really magical, to the point where you can’t imagine one without the other once you taste it. The result is a stout that is still roasty, but with this mellow sweetness and a roundness of body that is only enhanced by the nitro format.”

According to a press release, Nitro Merlin Milk Stout is a draft-only release that will be available across Firestone Walker’s entire distribution network starting today.