The sky cracked open and it falls down upon Earth!
That is what happen the moment Azief unleashes that sword energy. Azief eyes was shining blue and his entire body is swirling with unlimited power supplied to him by the world itself.
The Wheel above his head is supplying him with energy. The faith of the people of this world that prays to him, that hoped him win supply him with energy.
All of those intangible things supplied him with energy
And as such, the strike that he is about to brought down toward the Demon king is the strongest sword strike he had ever produced or could ever produce at his current strength
In his mind, the crystallization of his experience, his hard work was embedded in that sword slash.
The ending of this battle is near. It already had dragged long enough. A battle of such experts would usually ends in just a few moments.
Especially when there is a gap of power and level between them.