User blog comment:Zathronas/Analysis by an author: Volume 2 episode 9: Search and Destroy/@comment-10390252-20141003134556/@comment-24218038-20141003142225

I remember, but again from what the show tells us there's one aura.here'ssome examples.

''Pyrrha: Aura is the manifestation of our soul. It bears our burdens and shields our hearts. Have you ever felt you were being watched without knowing that someone was there?''

Pyrrha: (back on screen, walking around Jaune) With practice, our Aura can be our shield. Everyone has it, even animals.

Jaune: What about monsters?

Pyrrha: No.'' The monsters we fight lack a soul. They are creatures of Grimm, the manifestation of anonymity. They are the darkness, and we are the light.''

Aura isn't something in the air or something like the force, an energy everywhere. It is the manifestation of the soul.

I understand you are saying man created the Grimm with the darkness in their soul. But here's the problem with your speculation.

Narrator: ''Man, born from dust, was strong, wise, and resourceful, but he was born into an unforgiving world. An inevitable darkness -- creatures of destruction; the creatures of Grimm - set their sights on man and all of his creations''

They came AFTER the Grimm on remnant so they cannot bet he creators of it.