Black Excalibur

Black Excalibur (黒エクスカリバー, Kuro no Ekusukaribā) is a sword bestowed to Taraka by Angra Mainyu. It is welded from an unknown substance, although it is strong, and durable enough to cleanly-cleave through un-enhanced tools with ease, and without leaving any marks.

It was originally gold, although when it made contact with Taraka post-transformation, it became tainted, being dyed predominantly black, while emitting a red hue from its spine.