This includes the ability to pre-purchase Legacy of the Void. You can now purchase any of the three StarCraft II expansions in each of their respective in-game menus on the Campaign screen.These missions focus on Zeratul and serve to bridge the story between Heart of the Swarm and Legacy of the Void.To play these missions, click on Campaign and select Legacy of the Void > Prologue.Three new campaign missions that were previously only available in the Legacy of the Void Beta are now available to all players.