Talk:Focus/@comment-72.4.188.244-20151205140522/@comment-27158540-20151205170605

As a lone Tenno said, it represents metal. However the concept of Void/Emptiness is actually present in Chinese (and other asian) traditions.

You can look at Tao and some martial arts to see how it's intended as a lack of elements/energy or, in modern works of ficition inspired by such ideas, as an extra element altogether. In the latter cases, the trope is so radicated that if the villain doesn't use straight up "dark energy" it uses "void".