No, it wasn't entirely them. At least I don't think. Just that they, as a people, were straining the world's natural resources so... they did something about it.

[By sacrificing themselves.]

Back then there were so many, yet... I'm just one person and I alone... am....

[She shakes her head.]

In any case, the remaining Children of the Full Moon started the Empire, I believe. Perhaps as some sort of bargain for... killing off their race. Perhaps that is why, despite my distant relations, they consider me royalty.

[So fun fact, Estelle is a very distant relation to the actual throne but legit got thrust the title of princess because stupid old white men figured out pretty fucking quickly she's a Child of the Full Moon and wanted her power.

That's also why she got trapped in a castle.

Yep.]