So the Herdaziens and Horneaters came from cross-breeding. Would this have been from raping the Parshmen slaves or was there a period of harmony after humans came over from Asyhn? The Shins look so distinctly different that it makes me think there was a period of growth and migration for the humans and they once did co-exist and crossbreed with the Singers since Herdaziens and Horneaters have much different physical characteristics compared to the Shins. Perhaps Urithiru is a midway point between where the Humans use to live on the left of Roshar, where it’s more plush and green, and the singers lived closer to Alethkar, with inter-breeding happening as the humans pushed toward the Origin. Sanderson isn’t big on rape so they had to peacefully co-exist at some point.