"A Powerful substance residing in every daemon's and their human's body. Hue is essential when a human is syncing with their daemon. Thus, a sync's power is determined by the amount of hue in their body. Conveniently, Hue can also be used as a source of fuel. In fact, the majority of electricity in some cities is generated from Hues. Hue gives blood a colourful appearance, but they are not to be confused with each other. "