Excalibur, King Arthur's sword, black and silver

In Arthurian legends, the Lady of the Lake, often called Viviane, Nimuë or Niniane, is a major fairytale figure. Residing in a crystal palace hidden beneath the waters of Lake Comper in Brocéliande, she embodies the magic of the waters and the wisdom of ancient Celtic myths.
It was she who gave King Arthur the sword Excalibur, after his first blade broke. This magical sword, forged by fairies according to some versions, gives its bearer invincibility in battle, while its scabbard protects against injury.
Viviane also plays a crucial role in the education of Lancelot du Lac, whom she raises in her watery kingdom after the death of his father. She introduced the young knight to the arts, wisdom and courage, making him one of the most illustrious members of the Round Table.
At the end of Arthur's reign, after the battle of Camlann, she is again the one who receives Excalibur, when the dying king asks that the sword be returned to the lake, symbolizing the return of magic to its origin.