Fourth Wing (The Empyrean, #1)

by Rebecca Yarros

A dragon without its rider is a tragedy. A rider without their dragon is dead.

Blue dragons descend from the extraordinary Gormfaileas line. Known for their formidable size, they are the most ruthless, especially in the case of the rare Blue Daggertail, whose knifelike spikes at the tip of their tail can disembowel an enemy with one flick.