I like layered steel because its rippling pattern makes the blades look like liquid metal. There have been multiple versions of layered steel over the years. The most common form of layered steel is Damascus steel, but the original process to make it has long since been lost. The Japanese have a form of layered steel called Hada. Even my Viking ancestors had their own version of layered steel that resulted in formidable swords. The layers not only make the blades beautiful, but they also make the blades sharper and more durable than normal blades. I am thinking of including layered steel in my new fantasy book.