The Masamune

Sephiroth's signature weapon.

A large odachi measuring ~10 feet long, though it's length varies with Sephiroth's will. Though it's a two-handed sword, Sephiroth wields it with just his left hand. Like a G. The Masamune has space for six Materia slots. Sephiroth holds the Masamune at his waist, with the curved side facing his back. Some people say that when Sephiroth slashes, a high pitched hum can be heard. The Gold Saucer does sell a replica of the Masamune for patrons!

Magic & Materia

Quake3, Fire3, Ice3, Bolt3, Life2
Revive, Restore, Earth+All, Ice+All, Lightining+All, Fire
Scintilla, Shadow Flare, Flare, Megaflare, Gigaflare
Zanshin (Zanshin Rising), Hell's Gate, Infernal Gate, Pierce, Sword Dance, Telluric Fury, Shift Slash, Skyshatter, Warp, Retaliation Stance,

Known Materia Used

Octoslash

Shea has this to say