Demon Blade

The Demon Blades are a group of swords wielded by Ghirahim in his various apparences

The Swords
Those are the swords that are wielded by Ghirahim and thus considered as part of the Demon Blades
 * Demon Tribe Sword
 * Demon Longsword
 * True Demon Blade
 * 8-Bit Arrow
 * True Demon Blade +
 * Burning Demon Blade
 * Ghirahim's broadsword
 * Ghirahim's daggers
 * Ghirahim's rapier

The Legend of Zelda: Skyward Sword
The Demon Tribe Sword is first seen as Ghirahim is trying to break into the Skyview Spring he then use it during the second phase of Link's first battle with Ghirahim, he summons his Demon Tribe Sword and uses it against Link along with his daggers, he then use it against Impa but only to be stopped by Link he latter use it in his second and third battle with Link while still using his daggers alongside and his broadsword in his last fight with Link.

Hyrule Warriors/Hyrule Warriors Legends
IN the Hyrule warriors games the Demons Blades are Ghirahim's default weapons.

Super Smash Bros. for Nintendo 3DS / Wii U
In Super Smash Bros. for Nintendo 3DS / Wii U the Demon Tribe Sword and Ghirahim's daggers are used by Ghirahim himself when he is summoned as an Assist Trophy, Those are also in Ghirahim's Trophy.