Demon Tribe Sword is a sword wielded by the Demon Lord, Ghirahim in The Legend of Zelda: Skyward Sword.
During the second phase of Link's first battle with Ghirahim summons his Demon Tribe Sword and uses it to attack Link.
Ghirahim subsequently uses the sword when he attacks Impa and Zelda at the Temple of Time, only to be stopped by Link.
Ghirahim also uses it is in second and third battles with Link.
The Demon Tribe Sword was first named and appears as Ghirahim's default Level 1 weapon in his Demon Blade moveset and befitting its demonic origins it has a Darkness Elemental Attribute.
Ghirahim wields the Demon Tribe Sword when summoned as an Assist Trophy and appears on Ghirahim's Trophy.