The Fire Ascending (The Last Dragon Chronicles #7) by Chris d'Lacey
Condition: New, minor, dirty
David Rain and the Pennykettle dragons embark on their final adventure...
On Earth, dragons and darklings are trapped in a bitter, unresolved conflict. But at the dawn of history, something is working to bring about a change. A mysterious force is rewriting timelines, turning what was once legend into startling reality...
Under the control of the wicked sibyl Gwilanna, the evil Ix have taken over and infected all life-forms with their Shadow, creating a darkling army. Voss, the leader of the army, has captured and imprisoned Gawain, one of the last dragons in existence, and is using him to seek a dark energy buried in the heart of the Earth. Desperate to stop the Ix, the Pennykettle dragons summon David and Rosa, two mysterious travelers from the future, for help. But together, are they powerful enough to prevent Voss and the darkling army from destroying the world and restore life as it should be?