California’s Stone 17th Anniversary Götterdämmerung IPA will be available in bottles and/or on draft at select retailers, restaurants and bars across the U.S. Stone 17th Anniversary Götterdämmerung IPA is a double IPA, brewed with malts and hops traditionally used in German pilsners and is 9.5 percent alcohol-by-volume (ABV) and comes in at 102 international bittering units (IBUs). The beer is available in limited 22-ounce bottles and draft, beginning August 12, 2013. Founded by Greg Koch and Steve Wagner, Stone is the 10th largest craft brewer in the United States.