Excalibur

Excalibur, the Knights of the Round, the blessed sword of a legendary king who commanded a company of 12 mighty knights, such was their devotion to their lord and his cause that they follow him even in death. Their combined essence is now found in the Lapis Lazuli Magicite, and can only be located on the lost Isle of Bradamont, a place reachable only by a creature that can traverse all terrains.

Signature Attack:

Ultimate End- the spirits of all twelve knights take up their blades and attack a target, with Arthur himself wielding Excalibur to deliver the final blow.