That, my friends, is how you end a trilogy! Seriously I can't even say anything more about it other than she took the ending in a direction that most YA books don't go and it was perfection. Loved it. 
 I had some issues with Champion, mostly with their age (I'm sorry but nothing about any of their actions feels 15/16. Even though it's only 2 years I feel like 17/18 would be so much better!). 
 Overall though I really enjoyed the book and seriously the ending is... perfection!