The "races" in the Quest of Queens campaign setting are not "races" in the way we might think of the social construction. Instead, each race is a fully divergent species, and while all races might be sexually compatible with one another due to their common ancestor, interbreeding among them is generally not possible.
Strongmen and humans share the closest biological ties, suggesting the former are an offshoot of humanity, altered by ancient forces or divine intervention. Their unions produce hybrid offspring who exhibit the supernatural strength of their Strongman parents but inherit a human’s reduced lifespan. These children are not mere copies of their parents (when Strongmen have children, the offspring strongly resembles the mother or father) but unique individuals who blend the traits of both species. Despite their physical gifts, the short-lived nature of these hybrids often frames their existence as tragic.
The possibility of humans interbreeding with the High People remains the stuff of legend, with no verifiable evidence to confirm such unions. Stories like that of Queen Madeleine II—who claims descent from a Queen of the High People—are often dismissed by scholars as political mythmaking rather than historical fact. Yevim physiology, infused with the divine essence of Yevna, may create an insurmountable barrier to reproduction with mortals, though the cultural and spiritual implications of such myths endure.