4.5 stars.

A very good end to the series. Lots of action and great character building/maturing. I appreciate that Riordan trusts his readers enough to know that there need to be some sacrifices along the way for a good book and that not all characters can survive to the end if you want your conflict to be viewed realistically. It gave the book so much more power and I found so much more enjoyment in the fact that the risks of going into battle were real for these characters. Are there moments where good characters die? Yes. But it makes the author more trustworthy to tell a good story. Also, I'm very thankful that the Heroes of Olympus series exists. Because even though this is the last Percy Jackson, there is SO much more story to be told and I need it oh so much. Starting the Lost Hero very soon.