Worldwaker (The Great Iron War, Book 5)

Every victory is its own defeat. General Rommond's efforts to amass technological superiority over the enemy has resulted in the creation of a weapon that could destroy everything, and a faction just mad enough to use it. The Armageddon Brigade has awoken from its deep slumber, and it seeks to wake the world with it. Attracting the brightest, and most unstable, of minds, this splinter group of the Resistance has become the greatest thorn in Rommond's side. The Resistance and the Regime must unite to defeat a foe that answers to neither of them. Yet their deep divisions and long-held suspicions threaten to end the Great Iron War once and for all-by ending everything.