Truth

Azief uses the last bit of his strength and extracted the All Source. From the beginning he wanted to make the All Source as the connector. 

That is why he left it for the end

He could not help but think that this is the perfect connector of all of his Essence.

All Source energy could convert any emery to other energy. It is the ultimate method of transformation. 

And the moment the All-Source energy comes out from his body, it did not become an Essence Avatar 

Instead, like a misty ball that accumulate and gathered, it becomes like a translucent floating ball.

And in less than a second, tentacles-like tendrils sprouted out from this ball of energy and it moves swift like lightning and heading toward each one of the Essence avatars

It pierces evert single one of the avatars and the moment they were pierced, they turns into a ball of energy. 

All of this happens in a fraction of a second.