WoW's 11th Anniversary

WoW's 11th Anniversary is a Feat of Strength achievement earned for logging in during the 11th anniversary of World of Warcraft between November 16, 2015 to November 30, 2015. Everyone will receive a Anniversary Gift (old) in the mail, which contains:
 * Inflatable Thunderfury, Blessed Blade of the Windseeker
 * Exquisite Costume Set: "Edwin VanCleef"
 * Celebration Wand - Gnoll
 * Celebration Wand - Murloc
 * Celebration Package