User blog comment:Fairy Tail Grand Master/What is the hidden blade made of?/@comment-66.50.12.142-20120630222436/@comment-5503561-20120701183717

If we go by your logic, why a highly advanced race of humanoids which could basically mold a new species and control them via the artifacts, create a design for a weapon which required an act of self-harm to use (finger removal) - a design which would last for a solid couple of centuries before someone noticed that a missing finger really didn't go well with the whole 'hide in plain sight' thing.

So no, First Civilization did not create, nor envision Hidden Blades.