9 from the Nine Worlds
Rick Riordan
Magnus Chase and the Gods of Asgard (5)
The Dark Prophecy
The Trials of Apollo (2)
The Staff of Serapis
Demigods and Magicians (1)
Hero's Guide to Deadly Dragons
Cressida Cowell
How to Train Your Dragon (6)
How to Break a Dragon's Heart
How to Train Your Dragon (8)
The Chalice of the Gods
Percy Jackson and the Olympians (6)