The Golds (Philosophers – The Supreme Golds)
Metal: Gold
Rarity: Born only a few each generation.
Role: The "minds" — philosopher-kings who claim that wisdom flows in their veins.
Abilities: Intellectual and mental powers surpass all other tiers.
Upbringing: Raised in elite academies, far removed from the common people.
Status: They see themselves as the "sun of the city"; no one may challenge them.
The Silvers (The Guards)
Metal: Silver
Role: Soldiers, protectors, and judges.
Traits: Combine honor with strict discipline.
Training: Selected from childhood for military and ideological training.
Loyalty: Blind loyalty to the Golds.
The Irons (Workers and Engineers)
Metal: Iron
Role: The city's "productive power."
Occupations: Builders, craftsmen, engineers, miners.
Restrictions: Not allowed to study philosophy or bear arms except under Silver supervision.
The Coppers (The Lower Tier)
Metal: Copper
Role: The masses living at the bottom of society.
Traits: Poor, resilient, often exploited.
Occupations: Laborers, street merchants, miners' helpers, scavengers.
Restrictions: No access to formal education or advanced training; considered inferior by all higher tiers.
Potential: Though seen as weak, they sometimes possess unique sparks or talents capable of challenging the rigid social order.