Theory on violet for onyx storm

So in iron flame the venin refer to violet as “the one who commands the sky” not as the one who commands lightning or lightning wielder, and since we know it’s pretty common knowledge to anyone who knows how signets work, that the lightning comes from violet not the sky, it would seem odd that they refer to her that way. Unless they’re not talking about her signet, the whole series is named after the empyrean which is another word for sky, what if violet commands the empyrean? And since Andarna is the head of her own den as well it has me thinking it’s definitely all connected.