Murasame

The Murasame is a Katana appearing in some Final Fantasy titles.

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 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.