Your child tore through all of Wings of Fire and turned up asking what is next. This trail keeps the dragons and the epic scope they fell in love with and lines up six more to fly through, starting with the funniest, gentlest dragon book on the shelf and climbing all the way to a true, sweeping fantasy epic. Every stop has dragons or winged creatures at its heart, and the stakes and the page counts rise as they go.
Two things climb together on this trail: how long and dense the book is, and how heavy the story gets. It opens with How to Train Your Dragon, which is short, hilarious, and gentle, then moves through big warm quests where the dragons are friends. From there the dragons turn dangerous and political, the flying horses turn warlike, and it finishes on Eragon, the full epic, long and weighty, where a farm boy and his dragon carry real loss. A Wings of Fire reader will follow a dragon anywhere; this order just makes sure each next book is one they're ready to read and ready to feel. Note that these books are full of magic and battles by design. That's the genre a Wings of Fire fan is asking for, not a warning.