These books just get better and better. Seriously, there is so much awesome within these pages, I don't even know where to start. 
 Oh, wait, YES I DO! 
 (view spoiler)[NICO DI ANGELO IS GAY! You guys, a popular YA series has a gay character. And he's not relegated to comic relief! And Riordan handled it all so well!! Like, they're dealing with Cupid and Nico has to confront the fact that HE HAS A CRUSH ON PERCY JACKSON (Validated Shipper feels are validated!) and he's freaking out and shit which makes sense since he's from like...the thirties (iirc? or is it the forties? either way) PLUS he's a son of Hades which already makes him like...weird in most Demigods' eyes. 
 AND NICO! Oh Nico. Jason is all awesome about it and is all "It's okay!" and Nico's just like "Leave me alone!" Oh Nico. SO MANY NICO FEELS! You guys!! 
 Basically Nico is gay and Riordan didn't fuck it up. 
 The only thing that could make it better? If Leo is bi and they get together. I have this semi-horrible theory that Leo will die and hangout with Nico and they'll end up together that way. Which would suck because Dead Leo, but it would also kind of not suck? Yay mythology? (hide spoiler)] 
 Yeah, so THAT happened. 
 but that is not the only awesome thing! Because this book is a tome of awesomeness! 
 (view spoiler)[+PIPER VERSUS KHIONE! Guys, it's fucking awesome. She's like "Shit, I'm a daughter of Aphrodite, what can I do?!! OH, I KNOW, Charmspeak a mechanical dragon figurehead!" Then Khione's all like "Psh, you're a daughter of Aphrodite, you can't do jack, I'll just freeze you!" And Piper's like "You're hurting the people I love!" and Love conquers all (or at least the snow goddess) and IT'S SO FREAKING AWESOME! 
 AND THEN, Piper is like "Must learn to swordfight so I can do shit!" And Hazel obliges. Because the people in these books ROCK. 
 + Speaking of Hazel? Her scene with Hecate? FUCKING CREEPY. But it's okay, because Hazel learning to control the Mist is way cool. I love that she starts out failing because she really has no idea what she's doing, but she doesn't give up and manages to figure it out. With a little help from Pluto, of course. 
 + Leo! Leo and Calypso was freaking HEARTBREAKING. And adorable. SO ADORABLE! Leo needs all the hugs. Him and Nico. How about they hug each other? TOTALLY ACCEPTABLE. 
 + Tartarus was AMAZING. Everything in Tartarus. I loved it. I mean, I was on the edge of my seat worried as hell about Annabeth and Percy, BUT, it was still awesome. Gross, terrifying, and creeptastic, but awesome. 
 + ALSO, I love that Percy has to deal with the fact that he left Iapetus/Bob and didn't even think about him. Percy struggling with the thought that he uses people like the gods do was just. GAH it was so good. 
 + Frank Zhang is a badass. (hide spoiler)] 
 That was quite possibly the LEAST articulate review I have ever written. But it's okay, because this book kind of speaks for itself. Hell, this *series*! So much love. SO MUCH.