There are lots of details about the powers that the children have, and the world building is solid. I liked that the children had a quest that involved finding treasures, and that they make it to the training facility without having to travel through underground caverns! (There have been a lot of those in fantasy books lately!) It would have added an extra layer of interest to have more details about life in ancient China, and maybe an idea of a time frame for the setting. (You can tell I'm more interested in historical fiction than in fantasy!)
I enjoyed this one so much that I gave the ARC to a student who was walking his dog past my house, because I knew he was a big Rick Riordan fan! This will be popular with readers who like the Rick Riordan Presents books as well as newer titles like Silver Batal and the Water Dragon Races that have a good mix of different cultural setting, creative fantasy powers, and intriguing characters.