Princeps' fury

"After achieving a fragile alliance with the savage Canim, Alera's oldest foes, Tavi of Calderon is confronted by an invasion by the Vord, which forces the Aleran legions and Canim warriors into a desperate battle for survival against a dreaded mutual enemy."@en
"In book five of the Codex Alera series, the feared Vord seeks to destroy the new and fragile alliance between the Aleran and Cane by annihilating them both. Trapped in the Canim homeland that the Vord have decimated, the Aleran and Cane fight side by side in an attempt to prevail over their common enemy."@en
""Tavi of Calderon, now recognized as Princeps Gaius Octavian and heir to the crown, has achieved a fragile alliance with Alera's oldest foes, the savage Canim. But when Tavi and his legions guide the Canim safely to their lands, his worst fears are realized. The dreaded Vord--the enemy of Aleran and Cane alike--have spent the last three years laying waste to the Canim homeland."--Publisher's description."@en