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Excalibur (エクスカリバー, Ekusukaribā) was the name given to the legendary sword used by heroes and kings. It has a great power that is unrivaled by any other weapon present within the series continuity.

Despite being classified amongst the other demon weapons within existence in regards to its properties, Excalibur does not conform to the typical limitations of its brethren, as it turns out that in actuality anyone is capable of wielding him. However; in stark contradiction to this unique trait the number of people counted as his partner over the various centuries remains very few, due solely to the fact that no person is able to withstand his personality for extended periods of time, as he is regarded as having a bigger ego than Black Star which is only further exacerbated by an even shorter temper. It is for this reason alone that those who are able to use Excalibur are referred to using titles such as "hero" and "king", as only they possess the strength of will to put up with his numerous annoying habits, such as a list of one thousand things he demands to be completed daily, long enough to achieve something meaningful with him.

Due to Excalibur's dysfunctional personality, he holds himself in the highest regards at all times resulting in his most commonly used word being "fool" (baka), which is often employed to cut off anything that anyone else is saying while simultaneously putting them down.