For how hush hush the Erin thing is supposed to be, I get the feeling that everyone who’s anyone already knows or at least an inkling of what’s going on
Yo twilight scans it's probably supposed to be Shamayim-Aretz which is Hebrew for Heaven-Earth. I know in Korea and Japan they are kind of into Kaballah so they probably mean that (the transliteration here is just making me cringe a bit)
It's probably exactly that, but not so direct. It seems she had other lives in the middle, as her grandpa, the supreme demonlord, said he made a deal to make her soul wander for a little. But why is the question