The Siege of Canterlot is over and the Storm King defeated but Tempest Shadow, unofficially the new leader of the Storm King's army and antagonist turned protagonist, realizes there are other nations still under the former tyrant's iron fist. Redemption on her mind, Tempest takes off to put an end to this conflict, but not without help from some new friends. But as she and the others soon find out, war is more complicated than it seems and may prove too much a challenge, even to the Princess of Friendship.