I'm stuck at trying to get people into this series because the reading order is genuinely a bit of a mess? The first book is 'Wild Born' and you absolutely have to start there. Then you go into the 'Against the Tide' and 'Rise and Fall' trilogies—those four-book sets follow different sets of kids and animals. I think you're meant to jump between them as they were published, but honestly, reading each mini-series straight through works better. I tried the alternating way and kept forgetting which giant turtle or spider belonged to who. The 'Fall of the Beasts' books come later, but the shift in tone is jarring; some folks tap out before then.
What really helped me was just sticking with one set of characters at a time, starting with 'Wild Born', then all four books about Conor, Abeke, Meilin, and Rollan, before moving to the next group. The publisher's website has a list, but it reads like a subway map. Just keep the character guide from the first book handy.