It's a mechanical weapon.
It is made of human emotions and mechanical flesh and blood, so it is called Rongyan.
Yan refers to the real fire sulfur stone hidden in its body, Yan refers to the children who are stepped on by us to climb up, and Yan refers to the strong emotions that we have long since scrapped.
It keeps burning and never stops, making people blind, deafened, and full of resentment.
Concept: Resonance between machinery and spirit.