A few thoughts:
Grinwoody. Really? The Butler Did It? I guess the old tropes are new again, or something. That said, I'm curious what his capabilities will be in the next book.
The scene with Abbadon. Ok, he's a locust, or represents locusts or something. Then they go into how bad locusts were back in the day. I don't recall if they specifically said they were luxin-infused bugs, i.e. magic locusts, but my first thought was "How is that such a huge threat? They can do magic and figured out gunpowder but they've never figured out insecticide?" Also I'm a nerd and got an immediate Lexxx vibe
The thing with Kip absorbing all of the cards. It's an interesting idea, maybe he now has access to the memories and experiences of all of history's greatest figures, sort of like Paul Atreides. Not sure how that will relate to him gaining the power of the Lightbringer though, since that seems to be a power related to being able to do things, rather than know or predict things.
Teia's new cloak. Kip notices the 2 spheres on the back and how the dark covers the light when she goes invisible. What happens when the light covers the dark sphere? Plus in the room with Abbadon again the cloak had copies of all the cards on it, did that also translate somehow to the real world?