Caliburn

Caliburn is a sword also known as the "Golden Sword of Promised Victory" which appears in the Fate/stay night anime and visual novel series. The sword is one of the Noble Phantasms, a type of weapon or ability possessed by heroes of legend, that can be summoned and wielded by the characters in the series.

The Caliburn Saber is a powerful weapon that is said to have been wielded by King Arthur himself. It has a golden hilt and a straight blade, and is imbued with magical power that allows it to cut through almost anything. In the series, the sword is summoned by the character Saber, who is a heroic spirit and a reincarnation of King Arthur.

Saber is a skilled warrior and uses the Caliburn Saber in battle against other heroic spirits and enemies. She is able to perform powerful sword techniques, such as the "Invisible Air" which wraps the sword in a magical wind to increase its speed and cutting power. The sword also has the ability to release bursts of magical energy, which can be used to attack or defend against enemy attacks.

Overall, the Caliburn Saber is a powerful and iconic weapon in the Fate/stay night series. Its association with King Arthur and its magical properties make it a symbol of heroism and power, and it is an essential part of Saber's character and her role in the series.