There are 6 books in the Codex Alera series. The newest book is First Lord's Fury which came out in 2009.

1
Furies of Calderon

Book cover of Furies of Calderon
In this extraordinary fantasy epic, theĀ #1 New York Times bestselling author of the Dresden FilesĀ leads readers into a world where the fate of the realm rests on the shoulders of a boy with no power to call his own...
Ā 
For a thousand years, the people of Alera haveā€¦
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2
Academ's Fury

Book cover of Academ's Fury
In Furies of Calderon, #1 New York TimesĀ bestselling author Jim Butcher introduced readers to a world where the forces of nature take physical form. But now, it is human nature that threatens to throw the realm into chaosā€¦

For centuries, the people of Alera have harnessed the furiesā€”elementals ofā€¦

3
Cursor's Fury

Book cover of Cursor's Fury

Power-hungry Kalare has rebelled against Alera's aging First Lord, Gaius Sextus. Ill-equipped to face this attack, Gaius must seek support - even from the combative High Lord of Aquitaine. Kalare has also seized valuable hostages that could mean the difference between victory and failure. And Amara, the First Lord's Cursor,ā€¦

4
Captain's Fury

Book cover of Captain's Fury

Tavi of Calderon, now captain of his own Legion, has been fighting a bitter war for two years. Then he discovers the invading Canim warriors are harbingers of a far greater threat. The Canim are being hunted in their turn by a savage race that forced them from their homelandā€¦

5
Princep's Fury

Book cover of Princep's Fury

After bitter fighting, Tavi of Calderon has eventually forged an alliance with Alera's oldest foes, the savage Canim, and he must escort them on their long sea-voyage home. This will strain their fragile accord - but the worst is yet to come.

The inhuman Vord have spent the last threeā€¦

6
First Lord's Fury

Book cover of First Lord's Fury

The aging First Lord of Alera has fallen in battle. Yet his people must continue to resist an invading inhuman army. Desperate Alerans even pledge fealty to the Vord Queen to survive, turning the incredible power of Aleran furies back on their own people. And despite all efforts, the Aleransā€¦