HotS: Unlock Zagara (Hero)
You will be provided with a key that unlocks this hero on Heroes of the Storm.
Use it on this page: link
If Kerrigan is the Queen of the Zerg, then Zagara is the mother of the brood. Cunning and tenacious, she commands her vicious minions on the field of battle. Encounter her brood and beware: mess with her children and you answer to mama.