With the fate of the world at stake, the Sentinels launch a final attack on Atlas' HQ. Mitchell and Gideon successfully stop the missile. They find Irons as the other Sentinels prepare to bombard the building. Irons disables their exoskeletal armour, forcing Mitchell to release the exoskeleton to chase Irons. An explosion throws Irons off the building, hanging on Mitchell's left arm. Mitchell severs his prosthetics, sending Irons falling to his death. However, even though Irons is dead, Mitchell notes that this was only the beginning, and the war against Atlas is far from over.