World Cleaving Saber when it is activated it cleave a world of its life. It is something that Azief had used when he was at Earth Thirty-Nine when he fought against the Normies.
When he uses it at that time it forcefully plunders that world energy, cutting the world energy at its core.
But now, that same treatment is heaped upon the Demon King.
It grinded upon the Laws around the Demon King body, plunders his energy, cutting the Laws, creating disruption all over the world as these Laws were spread out and its energy absorbed by the All Source.
Azief knows that the Seresian demon had powerful physical body.
That alone made them a terrifying enemy but they also have the killing aura that acted like a layer of protection against their body.
He had weakened the Demon King by breaking his horn.
But Azief knows that it is not enough.