What role does the Caliburn sword play in the Arthurian legend?

The Caliburn sWord, also known as Excalibur, is a legendary weapon wielded by King Arthur in Arthurian legend. It is said to have been given to Arthur by the Lady of the Lake and is often depicted as a symbol of his rightful kingship and authority. The sWord is also associated with magical powers and is a key element in many of the stories surrounding King Arthur and his knights.