I apologize for the terminology, this canon is awful about it and the wiki actually makes things worse IMO, which is why I've avoided linking it (I thought I had it down from canon then I looked at the wiki and was like THREE PAGES ABOUT WAVE THEORY, ARE YOU KIDDING ME...). But yeah, Reyvateils are magic-users in her canon, and they're wired a little differently than normal humans because of it. So basically what I'm shooting for is the internal changes that'd let her connect to a power source (which she'll still need from elsewhere) to handle that magic properly. (And the spells themselves are separate Echoes.) But those internal changes would also mean she's got the side effect that comes with it, of needing a Diquility crystal every few months to keep from burning herself out.

If that last one doesn't work, that's cool, I can try to find a way to work around that - mostly I just wanted to make sure she'd actually be able to make the mental leap somehow to "maybe I should do something with that crystal so I don't die." I think I can figure a way to get her through the mental gymnastics to go "weird shit, better try something????" without it.