She taps her other weapon against the orbiting rock. "So, no illusions. Alright, I'll bite. You might expect to be disappointed, though. I can't exactly share my eyes." 

"My first priority is to understand your eyes. If they seem promising, my next step is to find a way to copy their effects if possible."

"Intriguing. And what do you need from me?" 

"Mostly I need to be there when you use them. I'm also curious if you've ever used them for anything other than destroying Grimm."

"Can't say that I have. How much do you know about silver eyes?" 

"All I know is what Ozpin said and that wasn't too detailed. Mostly that they can be used to destroy Grimm, that they seem not to be a semblance, and that the people who have them are sometimes targeted by a particular individual."

She's nodding faintly, until the end. She stiffens, slightly. "By who?" 

"She goes by Salem, somehow she became partially Grimm and she has some degree of control over other Grimm though we're not sure how much." This is a bit of an understatement. Based on their extensive observation they're pretty sure her only limit is in how many Grimm she can control directly at a time.

Silence, for a time. 

"Any good reason she's still alive?" 

"She has some weird immortality where if something would kill her she shows up elsewhere instead. The hope is that maybe the effects of your eyes could disrupt that somehow."

"Then what are we waiting for? Let's find some Grimm to vaporize." 

"I can just have a few teleported here. Any preference on kinds?"

"That's a damn fine trick. Surprise me." 

There's now a beowolf about ten meters away.

It snarls, dropping to all fours to get its bearings, then lunges at the pair. It only gets halfway before a brilliant silver-white flash washes over it. The Grimm disintegrates instantly. 

The effect registers to Riley's magical senses as unique among those encountered on Remnant thus far. Metaphysically speaking, it is neither Creation nor Destruction. Having integrated Remnant technology for measuring Aura, it is easy to notice that Maria's Aura did drop somewhat when it was used. By most metrics of Aura-per-effect, this was an astronomically efficient use of Aura, even after accounting for the fact that most of the released energy did not hit the Grimm. 

"Well that's deeply intriguing, your magic doesn't seem to be the based on that of the Gods of your world that we know about. Either there's a third god or your magic doesn't come from a god at all. It's also very promising." She looks over her scans, how did it interact with the magic of the Grimm... and how did it pull on her Aura.

"Really? Wait, those stories about the Brothers are true? How do you know that?" 

The flash had properties reminiscent of some kinds of antimagic. It neutralized the Grimm in a way very different, and largely orthogonal, to how Creation/Destruction antiparticles might theoretically interact (even assuming they could be forced together). The magnitude of the release is near the theoretical maximum energy for the lost Aura. The magic itself also contains a familiar signature, a cocktail of neutral and positive emotions characteristic of magics that require a particular mental state to produce. Love and determination are the most obvious in the mix. 

"We've found compelling evidence and we've talked with Salem and Ozpin both of whom claim to have been alive when the Brother Gods were present. It looks like you need to maintain a particular emotional state to do this is that correct?"

"You talked with the psychopath controlling the Grimm? And she didn't try to murder you? And yes, it's about - protecting life, preserving life, especially people you know and love." 

"Our diplomats are quite skilled. We're also a resource she wants to control. It's a dangerous balance we're striking but so far we think we've gotten more out of it than she has. Largely speaking we've gotten a lot of information on how she controls the Grimm and enough scans to have a decent chance of guessing whether something will put her down for good. We've also gotten useful information on her allies so we can neutralize them once she's out of the picture."

"Well, that's...good news, I suppose. Sounds like sleeping with the Taijitu to me, but what do I know, I just kill things. Speaking of, need me to dust some more?" 

"I'm not sure, are there variations in how it works? It there's variations it might be good to see and it wouldn't hurt to check. The main question is whether I can copy the effect with my magic or whether we need to get you to Salem and somehow avoid her killing you before you can kill her. I suspect that she's encountered people with your eyes before and so I doubt it's as simple as just getting you close. The first would be much better of course." Her context pool is also feeding her speculation that Silver Eyes are part of Salem's plan to kill the Gods they're considering whether they should ask her outright.

"Sometimes it petrifies Grimm instead of dusting them. Seems to be some combination of how much oomph I can give it and how powerful the Grimm is.

"...If Salem's the reason we're so rare then I bet she knows us, alright." 

"That might be it then. She has a lot more oomph behind her than a majority of the Grimm we've encountered. Maybe the amount of energy one of you can put behind things just isn't enough..."