I hadn't read the series at that point, so I kind of cautiously agreed (we were talking about a mix between magic and technology in a world) and put the book on my reading list.
A few weeks ago, I got my hands on Daughter of the Blood, the first in the series. I'm enjoying it so far, but I find myself stumbling over some things. Mainly, I don't feel like I have a great grasp of the world where this intriguing story takes place. I love the characters and the plot, but the world feels far away, hard to connect with.
Maybe I'm just one of those weird readers who wants to know every last detail about a world. But in this case, I feel a bit more explanation would be nice: what are the Jewels and how does one wear them, exactly? Is a Eyrian like a winged faerie or a bat-person or what? What's the difference between a demon-dead and a Guardian (they both seem like types of vampires to me)?
These are the little details that really bring a world to life for me. These are also the things my critique group tends to harp on (how does your magic work? Where does this creature fit in the universe?) They're also the easiest to miss, especially if you know your world extremely well.
It's a fine line to walk between giving the reader more information than they'll ever need for this story and not giving them enough to really feel immersed in your world. And, in all likelihood, it's going to take several revisions to reach that balance.
Don't give up! Worldbuilding is important and can be completely fascinating. It gives you an excuse to research really random topics you may not have had a reason to look into before. Like geography, mythology or linguistics.
Okay, I'm probably just a geek that I find things like that exciting. But the point remains: the devil's in the details when it comes to building worlds for speculative fiction. So pay attention!