Murasame

The Murasame is a Katana appearing in some Final Fantasy titles. It is often related to the Masamune in the games it appears in. The Murasame was named after a Japanese swordsmith, Senzo Muramasa, famous for his extreemly sharp blades. Murasama is said to have been a brilliant swordsmith, but also rather insane. According to legend, his swords were evil and bloodthirsty to the point that once drawn, it cannot be returned to its scabbard without having first drawn blood, even if it requires forcing the wielder to commit suicide.

Final Fantasy IV
The Murasame is one of the ultimate Katanas equippable by Edge, obtained in the Lunar Subterrane. It is a sister sword to the Masamune.

Final Fantasy VI
The Murasame is a Katana equippable by Cyan and some other party members. Betting this in the Colloseum will allow the player to win a Masamune, localized as the Aura in the Super Nintendo version.

Final Fantasy X
The Murasame is a Katana equippable by Auron, and has Half MP Cost as one of its abilities. Although it can be customized from any weapon, one can be obtained by entering the password MURASAME in the Airship.

Final Fantasy XII
The Murasame is the second best Katana, next to the Masamune. Any character can equip it, provided they have learned the "Katanas 4" license. It can be bought at the Phon Coast, and has Water damage as an added effect.