The Tower of Nero

 I spent a decent amount of this book crying! I loved the characters relationships and Apollo's growth as a character. I cried a lot over the Arrow of Dodona, and Apollo's almost death. The ending was very sweet with him visiting everyone, and I think the Chalice of the Gods storyline and the Sun and the Star were referenced so I'm excited to read those soon. I can't believe the Trials of Apollo are over. I enjoyed the series more than I thought I would originally. Definitely worthy of a reread in a few years.