The perfect accompaniment to a Witcher 3 Ciri costume is a sword; she’s an expert sword fighter after all. Performer and props maker Alan Padziński made a beautiful replica from scratch. He said he started with a typical forging process:
A piece of bar stock was heated and then drawn out to create a tang. The blade’s bevels were created by manual forging.
Then he heated the steel again and split it to create a wide opening. This was done to maintain the strength of the steel because “most of the vertical grain within the steel is bent rather than broken.” Though he thinks he would probably be best to machine one, I think you can’t beat the charm of a handmade sword.