It was...some sort of strange puppet.
"What is...?" Gray's eyes opened wide.
"An autonomous puppet?!" Even my voice suddenly leaked out.
Weren't Automata capable of fighting independently already a lost art? Cases like
Trimmau, where the core was really something entirely different were one thing, but
the Concept of Homunculus creation was steeply in decline. As knowledge of the
human body deepened and spread throughout humanity, from the point humanity
accepted that there were no Mysteries to be found within their own bodies, it had lost
the grounds to be a field of Magecraft.
No, even if we accepted my brother's theory that the human body still was as a black
box, and the Mystery within it was not yet entirely erased, the fact that modern magi in
the field couldn't compare to even antiques from hundreds of years ago was an
undeniable fact.
In that case, this was-
(Antiques? No, it looks far too new for that...)

The Case Files of Lord El-Melloi II, Volume 2, Chapter 3