First Lord's Fury

First Lord's Fury is a 2009 high fantasy novel by Jim Butcher. It is the sixth and final book of the Codex Alera novel series.

For years he has endured the endless trials and triumphs of a man whose skill and power could not be restrained. Battling ancient enemies, forging new alliances, and confronting the corruption within his own land, Gaius Octavian became a legendary man of war – and the rightful First Lord of Alera.

But now, the savage Vord are on the march, and Octavian must lead his legions to the Calderon Valley to stand against them – using all of his intelligence, ingenuity, and furycraft to save their world from eternal darkness.