Six Sisters

At the time of the Great War, beings that ruled over the Hundred A-rays.
It's said that they look just like humans, and that all six looked like witches in a fairy story wearing a black hat and riding on a broom stick. Each one of them carried an ability that surpasses all the hundred A-rays.
Near the end of the Great War, the youngest sister, “Judge” was defeated by a Knight, but her death cry tore apart a continent. The whereabouts of the remaining five is unknown.

Angel Voice: Notes.