Exos (Second Human Empire: the Mechinized Children of the Children of Earth or simply Mechinized Child) are a species of humanoid machines found in Destiny Earth. Exo began as self-aware war machines developed by humanity during the Golden Age[2] for a long forgotten war,[1] with the sole purpose of protecting their creators.[3] They were rebooted during the collapse and now have no memory of their original function.[4] Exos are "so advanced that nothing short of a Ghost can understand their inner functions. They remain ciphers, even to themselves; their origins and purpose lost to time. Whoever built the Exos fashioned them in humanity's image, gifting them with diversity of mind and body. Many of the City's Exo citizens live and work alongside their organic brethren, yet others fight again, reforged in the Light of the Traveler to serve as Guardians.". The Exos joined the Alliance of Nations to battling against the Mechari, a race that is also humanoid machines.

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