I've seen some fan theories this week about how everything goes down next book, but I think we've already been told how this goes down, and it sounds absolutely glorious!
It took me an hour or two since I couldn't remember enough of the quote (and I thought it happened earlier in the series), but I found a line that makes the next book sound that much more exciting...
Only if the Mad King managed to find or create a truly devastating weapon could he be a threat while Ozriel was gone, and that possibility was vanishingly remote. It was only slightly more likely than Makiel disbanding the entire Court of Seven and joining the Vroshir.
Wight, Will. Reaper (Cradle Book 10) (p.