I had this idea - what if there was a class that specialized in taking random bits of metal on the spot of the battle and making weapons with which to attack? Sort of like a blacksmith, but much faster - normally they would take reduced time, and then so many times per day they could "lightning craft" - allowing them to seemingly throw perfect weapons together from little more than scraps - as they move across the battlefield, their hands seem to move at ridiculous speeds, and they appear in a state of complete focus. Running up to the enemy, their weapon appears almost to put itself together, up until the last instant before the enemy is struck with the still-hot blade.

Was there ever anything like this before?