As the freshest conscript aboard the walking fortress of Revance, Ryza forges a name for himself in battle. The enemy are the smelters, bandits that trade in reanimated corpses. But for Ryza, the bloodshed represents a path of redemption for an upbringing he's just escaped. His prowess with a rifle draws the interest of the Locusts, a clandestine faction within Revance's ranks. It turns out that not all aboard the fortress seek to stamp out the plague of molten flux, the mysterious liquid metal that fills the bodies of the dead and makes them walk again. Some seek to profit. The reanimated corpses -known as autominds- are used to control enormous contraptions of magnetically enchanted metal, forming the backbone of The Droughtland's factories. The only thing stopping the smelters from expanding their illicit industry is Revance. The Locusts make Ryza an offer. Either help overthrow Revance to do the smelter's bidding or reveal his father's legacy as the very thing Ryza now fights against. The former is unthinkable. The latter means death. Ryza resolves to infiltrate them and expose the mutiny, plunging him back into the murky underworld of the smelters, testing his convictions, and even leading him to the ancient origins of molten flux itself.