Before the Dawn

“Long story short, it looks like the Grimm are attracted to the pretty
Aura coming from Gill Asturias and the Crown’s forces.”
“What?!” Argento said. He was joined by confused comments from
other Crownsmen.
Gill looked around at the Grimm who had been advancing on her
position. Could that be what was happening?
Gill had experimented once with transferring Aura into a Grimm that
had been roaming near the Wasteland base. The Aura had been absorbed
quickly and began pulling more from Gill, faster and faster, until she ended
their connection.
The Grimm hadn’t seemed altered by the Aura at all. Whatever they
were, they didn’t use it for power, and they didn’t have souls. But it had
consumed the Aura, and she had wondered if the thing that drew Grimm so
strongly to humans and Faunus wasn’t just their emotions—after all, even
animals have those—but perhaps also their very souls. Their Aura.
If that was the case, she was maybe in trouble here.
“This is my point: Do not attack the Grimm, unless they attack you
first,” Fox sent. “Let them go after the Crown’s army and the Asturias
twins.”

Before the Dawn p.237