Exo

Exos are a species of humanoid machines, both for players and non-player characters, in Destiny.

History and Origins
Exos began as self-aware war machines developed by humanity during the Golden Age for a long forgotten war, with the sole purpose of protecting their creators. They were rebooted during the Collapse and now have no memory of their original function. 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, while others fight again, reforged in the Light of the Traveler to serve as Guardians."

Notable Exos

 * Aiza-3
 * Anahera-3
 * Banshee-44
 * Cayde-6 (deceased)
 * Cron-8
 * Eriana-3 (deceased)
 * Exo Stranger
 * Gaunt
 * Lakshmi-2
 * Lilavati-12
 * Marlenx-3
 * Saint-14 (deceased)
 * Shiro-4
 * Tinasha-3 (deceased)

Trivia

 * In terms of player design, Bungie drew its inspiration for the Exo from such sources as the Master Chief, The Terminator, and the undead. At their presentation at the 2013 Game Developers Conference, those of the species were described by Joseph Staten and Christopher Barrett as being "sinister, powerful, and tireless."
 * It is possible that the number after an Exo's name represents the number of times their memory has been wiped, as evidenced by Banshee-44's dialogue..
 * This is duly confirmed by the player's Ghost when scanning a journal in the Tower in Destiny 2.
 * According to some sources, Exo Guardians experience a high rate of insomnia, second only to Hunters.
 * The Neuroghast 1.0 armor set was designed especially for Exo Hunters.