In the Black Iron Empire, which relies on burning "spiritual marrow" to drive machinery, a low-level scavenger named Ren accidentally dug up the skeleton of an ancient god with no traces of mechanical transformation. This skeleton not only broke the empire's lie that "the gods are dead", but also made him the prey of the Inquisition. In order to survive, Renn took the skeleton and embarked on an escape journey to find the legendary "Land Without Ember". As gears and spells collide, he must decide: become the fuel for a new empire, or be the first fire to ignite the old gods.