Where would you have split it?

As I’ve mentioned before, I thought long and hard about potentially splitting Book 5 into two books. In the end, however, I decided to keep the book in one piece, resulting in an impressively lengthy tome.

If, however, the book was going to be split in two, where would you have split it? I am, of course, aiming this question at people who have finished reading the book.

The book has 42 chapters. I would probably have split it up into Chapters 1-21 and Chapters 22-42. Another viable split is 1-22...