Chapter 278: Ambush! 3
Authorities reach some point where they don't make sense any longer, and that is because that is exactly why they're called authorities.
The reason why a person only takes an authority and tries to use it to reach the peak is because any authority can in a way or another do all that another authority can do.
Authorities were mystical and their whole existence was only limited by imagination.
The difference between authorities was merely the quality.
It could be said that while someone with a space authority could just teleport, someone with fire authority for example, could do the same thing but with his own concept, like burning space to non-existence and then stepping on it.
A fire portal so to speak.