How to Break a Dragon's Heart
Cressida Cowell
How to Train Your Dragon (8)
Hero's Guide to Deadly Dragons
How to Train Your Dragon (6)
Tales From the Perilous Realm
Alan Lee
9 from the Nine Worlds
Rick Riordan
Magnus Chase and the Gods of Asgard (5)
The Burning Maze
The Trials of Apollo (3)
Percy Jackson's Greek Gods
Rick Riordan & John Rocco
The Son of Neptune
The Heroes of Olympus (2)