Diablo 20th Anniversary Celebration is now live and this is how you Will het into the Secret Cow level in World of Warcraft!
Find a Treasure Goblin. A Treasure Goblin spawn throughout Broken Isles, dungeons and the Dalaran Sewers. You need to kill them to step through their portal to the Secret Cow Level.
Kill The King Cow to obtain the Twelve-String Guitar and to unlock the Diablo’s 20th Anniversary achievement!
This event is from January 4 – 11 2017!