Salamander

Taking place in the midst of the War of Cybernetics, the young and feeble Alan finds himself in a grim situation. A situation that causes him to leave his hometown with a group of the King's army known as The Collectors - people whose soul purpose is to collect kids in each town of the Kingdom to draft them into the war.

That is when Alan realizes the full extent of the tactics that are being used in the war. Tactics that involve taking over a person's will and transforming them into monsters, enlightened to the point of madness. Their transformation is based off of the gas in which they had inhaled, and they are classified into four categories: Witches, Enlightened, Giants, and Grazers.

With the help of a scientist who takes the bodies of dead individuals and turns them into robotic soldiers, Alan must convince the newly-appointed Emperor to revoke the Collection Process in favor of said robots.

The War of Cybernetics is, indeed, an unusual one . . .