Mind you that yes Automail is mechanical and this is the future. The only man alive so far that has no knowledge on this would be Dr.Hidieo, though anyone can make a NPC for it. They would have to ask permission for the Admins, and the head admin. Anyone attempting to Meta-game knowledge without attempting to make there character meet this man would be voided. Due to human modifications is illegal in Kasaihana city and only a few know of it.
Automail and how it works...
"Automail" is the common term for automotive armored prostheses. Originally devised as a sort of motorized battle armor automail eventually became advanced enough to double as prosthetic body parts for amputees desiring something more versatile than normal prosthetic limbs.
Though arguably useful, the set of drawbacks unique to automotive prostheses is enough that many are loath to undergo the upgrade from standard prosthetic attachments. The installation process, which requires a specialist in bio-mechanical engineering (that is to say, both advanced mechanical engineering and surgical medicine), is understandably expensive and notably painful, as certain body parts must often be further amputated in order to accommodate new automails properly and the sensitive nervous system registers all types of over-stimulation involved as intense pain. Those receiving automail for the first time must also have each nerve painfully connected to a permanent housing system on the body, as well as have all the nerves connected simultaneously when the limb is later attached to the housing system. The recovery from surgery, including the period of time necessary to fully master the use of automail limbs, is noted to take roughly three years on average (though full recoveries lasting as short as one year have been documented, and a recovery period as short as six months was stated as a possibility but was not confirmed) and even after such time, automail prostheses must be meticulously maintained with regular oiling and frequent overhauls which necessitate that the automotive parts be disconnected from and then painfully reconnected to the nervous system in order to remain in proper working order.
Though automails are generally used as an advanced medical tool to facilitate the lives of amputees, within the country of Amestris (which has seen a significant rise in automail usage in its past two decades of constant, successive wars), automail has developed into a venue for weapons development as well, resulting in "combat automail". Using various techniques, these machines, previously used only for movement, have begun to incorporate armaments such as diamond-tipped claws, hidden blades and even firearms, sometimes willingly at the expense of normal limb functionality. As such, there has also been a rise in the number of fanatical automail hobbyists who willingly sacrifice flesh-and-blood body parts by way of operation in order to obtain weaponized combat automail appendages.