A Militia battleship, the Allegiance, makes a narrow escape after a failed raid on a IMC outpost and to a darker, parallel Earth, where giant humanoids called Titans rule the land while the local population are nothing more than prey to this unstoppable foe. When a group of experienced Militia Pilots arrive, they will slowly struggle with the journey ahead, in both mind and spirit.

After escaping the destruction of the Ark, the Chief and the Arbiter have no choice but to go to cyrosleep aboard the remains of the Dawn. Their peaceful sleep will soon be interrupted as they crash-land on Etheria and help the Great Rebellion fight against the Tyrannical forces of the Horde. Will they save the planet and its inhabitants, or leave it in total destruction?