I've seen only theories floating around but nothing solid. Perhaps the Heavenly library has some information, though I won't bet on it.
Where I come from some magi are able to create homunculi, which have a little self-awareness akin to those soulless shinki that I saw. From what I've heard it's the process of their creation that forces various limitations upon them, be it a shorter lifespan, physical oddities or other shortcomings.
text; from Archer
Where I come from some magi are able to create homunculi, which have a little self-awareness akin to those soulless shinki that I saw. From what I've heard it's the process of their creation that forces various limitations upon them, be it a shorter lifespan, physical oddities or other shortcomings.