[X] Onmur
Moralizing against Riona isn't going to work, she's clearly heard it all before, if we want to redeem her and potentially save the girls in her care then we need to establish a working relationship with her. It's not that we "need" her for something. It's that initiating hostilities accomplishes nothing except stroking our white knight complex. Sure it "Frees the souls" but it either "Frees them into death" which isn't really saving anyone, or it "returns them automatically" which means a bunch of coma patients with no support, along with more than a few actively malicious grief controllers (even if, miraculously none of her other girls are evil).
Beyond that, I am also getting really tired of all the people judging her. The more I see of her character, the more I see
actually Kyoko. Or does anyone think, for a second, if Kyoko had Riona's power she wouldn't behave exactly the same way? If we refuse to judge her positively simply based on her usefulness (which I agree with), then we shouldn't judge her negatively just because she's so powerful. We can't have our cake and eat it too. In PMMM-verse, we usually don't even get a cake to begin with.
Being unconscious is not the same as being used as a slave. Gemming her is more like prison.
We have no indication that the Shades are "aware" Riona says they aren't. I'm inclined to believe her because she's shown a willingness to disgorge the worst aspects of her power so I don't see why she'd lie here. And arguing that something is better because it's like
solitary confinement is not an upgrade. Prison is, in a lot of cases, comparable to slavery. Yes, we don't have any indication that she'll be aware, but if that's the case we'll
still be doing what Riona is doing, if her Shades are not aware. Plus, again, if any girl would be aware of their gem form, it would be Riona.
Idea for convincing Riona we're different.
[X]You want my power that badly? Do you have any power copiers you can try to get mine? The ones I've met can't do it. I could use an insurance policy.
No way to enforce that. She gets our power and she's out, who know, maybe she just kills us too then for being an idiot because we can't be trusted with our power (though less likely). Either way though, we lose all ability to enforce any agreement on her, not the least of which because we just gave away the tactical advantage.
Which specifically do not allow for a net gain in magic capacity. We're the only free lunch in town.
She could easily have a controller move her grief into a grief seed while she sleep. She could also, among other things, have a girl who obviates the need for sleep. She has plenty of powers. Any one of them could solve this problem.