Princeps' Fury is a 2008 high fantasy novel by Jim Butcher. It is book five of the Codex Alera novel series. 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. And when the Alerans are cut off from their ships, they find themselves with no choice but to fight shoulder to shoulder if they are to survive. For a thousand years, Alera and her furies have withstood every enemy, and survived every foe. The thousand years are over...
Plot
The book begins with Octavian negotiating with Captain Demos of the trading vessel called the Slive, to book passage for Octavian and his contingent to cross the sea and reach the Canean homeland with Varg. Meanwhile in Alera, Crown cursor Ehren reports to Gaius about the Vord having entered Alera and learnt how to furycraft. Octavian and the Canean survivors face several storms as they make their way for the Canim continent. Octavian learns more about the Canean civilization, which has several tribes with populations in the millions and also learns the Canim tongue as they prepare to disembark. Amara and Count Bernand are helping improve the defensive structures around Calderon Valley, in anticipation of a future Vord assault. However, they are summoned to an Imperial Council by Gaius Sextus, First Lord of Alera, for an urgent mission against the Vord. Gaius Sextus informs the Council of the threat of the Vord, which was slowly expanding from the Kalare wasteland. The Vord had overwhelmed four Imperial legions, leaving no survivors and the croach was expanding through Alera at an increasing rate. More than one hundred thousand Aleran freeholders and citizens had been killed in less than a month. Gaius requests all the High Lords of Alera to unite their strength and muster all the legions that they could, so that they could force a big battle against the Vord. Gaius appoints High Lord Aquitaine as the captain of the military campaign. The First Lord also meets Countess Amara and Count Bernard and requests them to go behind the Vord enemy lineson a mission to find out how the Vord are using furycrafting when they had been unable to do so. Amara and Bernard find out that one of the High Lady's has been taken by the Vord Queen and that Brencis Kalarus is using his father's slave collars on Citizens to make them fight for the Vord. They take out Brencis and without him and his knowledge, the Vord Queen loses the ability to collar any more Citizens. Tavi formulates a plan to take down a Vord Queen in Cania, thus allowing the surviving Canim to escape to Alera to regroup and plan how to take back their homeland. His plan fails but Kitai and Varg's backup plan works perfectly. Everyone escapes on giant ships sculpted from icebergs. Isana is sent north to the Shield Wall to broker a piece with the Icemen so the Legions guarding the Wall can march South and bolster those fighting the Vord. She realizes the Icemen are empathetic crafters and that the whole war has been a gigantic misunderstanding. She challenges the Lord of the Legions to Juris Macti to force him to march South. She loses but her standing up to him makes him realize the truth of her position. The Vord overwhelm the Capital City and Gaius destroys the city and all the surrounding Vord to give the rest of the people a chance to formulate a way to fight back against the Vord.
