At her father's side, the glow of the fire lighting his face: Tatara satetsu and patience. Break the kera, find the Three Steels, hochotetsu, tamahagane, nabegane. Hochotetsu is the core, the others are the skin. Fold the steel, Mako. When you have folded it sixteen times and forge-welded it sixteen times it is ready to become a blade... What an earthquake I never felt an earthquake before! You are my only daughter whatever anyone tells you never believe I loved you any less than I would have a son Never believe that Fold the steel Forge-weld it again you can be the steel but first you must be forged. We have forged steel for twenty generations Mako and it has forged us as well.
- Pacific Rim: The Official Novelization pg 145 Alex Irvine