Excalibur

The Excalibur is the most famous sword in Earth history. It first appeared in the episode, An American Benwolf in London.

Appearance
It is shaped as a sword normally embedded in the stone as a protective measure.

Backstory
In ancient times, the sword had been wielded by famous historical figures such as Sigurd and Beowulf, though its most well-known owner was King Arthur. It has gone by many names, but it's best-known as Excalibur. The sword was last used in the war against the Napoleon and stored in the underwater vault of Britannia in the Thames River.

Abilities
According to legend, the sword will make anyone who wields it in battle invincible. Whether or not this is true, or if it is even greater than Azmuth's sword Ascalon is unknown. However, it is embedded within a stone in which only the truly worthy may remove it. It is such that not even a mutated Joseph Chadwick, or Ben who used both Four Arms and Humungousaur could pull it free. However, Kai Green was able to move it a little, which means either she was worthy, or that the sword was loosened by Chadwick's and Ben's efforts.

Appearances

 * An American Benwolf in London (first appearance)

Trivia

 * Only one who is worthy can remove Excalibur from the stone.
 * It is implied that Kai Green is worthy.