Bear with me, but I have a crazy theory!
Don't read this if you haven't read books 1-3 and Threshing Day!
I haven't exactly figured out all points of the theory, but I think some of the dragons are wanting their riders to turn, or at least just know in advance that they will. And I think it has something to do with the hatching ground maybe... ? Which is why some eggs are missing at the end of Onyx Storm.
And hand in hand with this... What if "the brother" Xaden talks about in his POV, isn't the only one who has also turned? What if ALL the missing cadets mentioned in OS are now venin?
Because when I heard Garrick's POV in Threshing Day, I was certain he was the venin brother.
"It might surprise you to find that nothing is too difficult to me." - Garrick
"Quite the contrary, I'm counting on it." - Chradh
So is Chradh counting on something being too difficult for Garrick... ? Perhaps, Garrick not having enough power to save his friends, making him channel... ?
(Or maybe he just means he's counting on the fact that Garrick will stop at nothing for those he cares about, but that too could be foreshadowing, right?)
But then when I heard Bodhi's, I could see how he could be the venin brother too, because of quotes like, "... until your death or demise." said by Cuir, as well as when Bodhi vows he will "never be powerless again."
So what if they both end up venin, along with some of the others?
In Threshing Day, Xaden admits to Sgaeyl that he plans to burn Basgiath to the ground, and then he's surprised that she's okay with that because the Vale is there and that's their hatching ground...
So what if the dragons wanted them to turn or knew they would turn, and it helps the dragons to break free of having to help Navarrians because they could start a new hatching ground in Aretia? And that's why there are eggs missing at the end of OS!
So perhaps these dragons know their riders enough to know they won't completely turn/lose their souls because they're turning for the right reasons? I DON'T KNOW!
But something that works against my theory is Sgaeyl telling Xaden not to channel for her when she's tied up... I don't know how that would fit in 🤔
But as I said, I haven't worked it all out yet. And I could definitely be COMPLETELY wrong. I just wanted to share to see other people's take on this.
Can all the dragons be trusted?
Did more than one other person turn? (Garrick, Bodhi, the other missing riders, one of which could be Aaric... ?)
Discuss this with me, please! Talk me down from my crazy theories or back me up with them!
And can the next book please come out this winter?! 😭