Gi - StarCraft 2: Heart of the Swarm is the expansion pack released by Blizzard Entertainment on March 12, 2013 with release party events taking place worldwide. Gaming Illustrated attended the event at The Spectrum in Irvine, California, just miles away from Blizzard’s main campus. Heart of the Swarm follows up on Wings of Liberty and follows the popular Zerg race and their leader, Sarah Kerrigan. The story line in Heart of the Swarm is darker, deeper, and more emotional than gamers saw in the previous edition. As the second installment of the StarCraft 2 saga, players will enjoy a new single-player campaign and massive upgrades to the multiplayer experience.