Blizzard Entertainment launched its second major franchise with the role-playing game Diablo. Diablo's fictional universe was created by David Brevik, Metzen and fellow designer Bill Roper, and Metzen also provided voice acting for some of the game's characters. This date is significant because it marked the beginning of the Diablo franchise, another hugely successful property for Blizzard Entertainment. Metzen played a key role in developing the game's lore and voice acting.