Crooked Stave Artisan Beer Project and Evil Twin Brewing have collaborated on a beer that holds a monumental distinction.

The two breweries brewed the as-yet unnamed imperial porter at Denver, Colo.-based Crooked Stave on March 2 and March 3, and it will be aged in Heaven Hills bourbon barrels for “about a year.” According to Jeppe Jarnit-Bjergsø, owner of Evil Twin, the new beer is the first “non-wild Crooked Stave ever!”

Although no release date has been set, Jarnit-Bjergsø, told Tenemu in an email that the imperial porter will be released “when its ready, could be a long time.”