Demon Tribe Sword

Demon Tribe Sword is a sword wielded by the Demon Lord, Ghirahim in The Legend of Zelda: Skyward Sword.

The Legend of Zelda: Skyward Sword
During the second phase of Link's first battle with Ghirahim summons the 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.

Hyrule Warriors
The Demon Tribe Sword was named and appears as Ghirahim's default Level 1 Demon Blade.

Super Smash Bros. for Nintendo 3DS / Wii U
Ghirahim wields the Demon Tribe Sword when summoned as an Assist Trophy.