After spending so much time with Percy and his crew, we have finally reached an end (or have we? Since Riordan is going to publish a book with Apollo...and camp half-blood. BUT I DIGRESS!). It's a little sad to know this is one of the last times I'll be seeing these characters I have come to love in this short amount of time I've spent with them. But I loved every second of it. Overall, I loved the series but this book had a bit of it's tumbling moments. 
 Now comes the spoiler-ish portions of my review. Or I call it spoilers so to whomever who haven't read it won't be expecting certain things. Maybe their feelings are different. 
 Anyway, first and foremost, I loved the character development of Nico and Reyna. In fact, I loved them even more after reading this. Over the course of the books, we mainly saw Reyna as a ruler and someone who's strong. Someone who's been abandoned but was able to stand her guard. Nico, to me was a son of Hades who's help was always one of the greatest. Especially as seen after befriending Bob or else Percy and Annabeth may not have survived in Tartarus. Their relationship was also something I looked forward to reading as I progressed in this book. 
 However, the tumbling moments occurred at the end. The ending fight seemed to be too easy. We all knew Gaea would awaken - but the battle was so easy. I understand that they have been developing their powers over time but Gaea, being an older goddess and force to be reckoned with was just told a few words by Piper's charmspeak and was put into a sleepiness spell. It just seemed too easy; too perfect. I'm not saying I'm not happy that they won but I thought it would be more epic - more battles perhap. But I'm not sure what would make this scene better. 
 And at the end, to have Festus inject Leo was brilliant. I just wished I saw more of what had happened afterwards. How Leo and Calypso would've found camp half-blood and there would be more tears and hugs. I just wanted to know more of what had happened after everything. Maybe we'll find out more in Apollo's version :)?