Masamune

Masamune is the great katana which known wielded by Sephiroth the main antagonist character on final fantasy 7.Has great destructive power type of sword. In japan,The swords of Masamune have a reputation for superior beauty and quality, remarkable in a period where the steel necessary for swords was often impure. He is considered to have brought to perfection the art of 'nie' (martensitic crystals embedded in pearlite matrix, thought to resemble stars in the night sky).Masamune studied under Shintōgo Kunimitsu and made blades in suguha (straight temper line) but he made magnificent notare hamon, where the leading edge of blade slowly undulates where it was quenched. There are also some blades with ko-midare (small irregularities), a style which appears to have been copied from the Old Bizen and Hoki Province styles. His works are well-characterized by rich chikei (clear grey lines on the leading edge), kinsuji (lines like lightning streaking across the blade) and beautiful nie (a grey shadow on the front of the blade caused by quenching).
Swords created by Masamune often are referred to with the smith's name (as with other pieces of artwork), often with a name for the individual sword as well. The "Honjo Masamune", a symbol of the Tokugawa shogunate and passed down from one shogun to another, is perhaps the best known Masamune sword.

Signed works of Masamune are rare. The examples "Fudo Masamune", "Kyogoku Masamune", and "Daikoku Masamune" are accepted as his genuine works. Judging from his style, he was active from the late Kamakura period to the Nanboku-cho era.