The Soldiers of Halla (Pendragon, #10)

It has all been leading to this.
Every victory. Every loss. All the thrills and sadness; the hope and despair. Bobby Pendragon's heart-pounding journey through time and space has brought him to this epic moment. He and his fellow Travelers must join forces for one last desperate battle against Saint Dane. At stake is not only the tenth and final territory, but all that ever was or will be. Everywhere.

This is the war for Halla.

Every question is answered. Every truth is revealed.

The final battle has begun.