Contrary to popular belief, Ashtel's reputation of being extremely powerful doesn't rely solely on his 'World Authority'.
His world authority, 'Shockwave', certainly isn't something to be scoffed at, but it isn't one of the most powerful out there.
There are world authorities like Idri's 'Absolute Rule' that can make anything possible, and there are world authorities like Fenix's that can make a certain territory completely under his control.
There are people who have world authorities that can do fancy stuff like heal others or even control vitality, etc.
But all of this doesn't matter.
In the world, no 'World Authority' is actually weak; all 'World Authorities' are supposed to be equal from the start; the difference originates from the user itself.
The world Authority 'Shockwave', is the perfect one for Ashtel.
It grants him the power to control the shockwaves, vibrations, and even subtle movements of cosmic forces.