Skaa
The Skaa
The Skaa are a race of humans on Scadrial, currently featured in The Mistborn Trilogy. The Skaa were effectively created by The Lord Ruler when he forcibly divided the people of the world. Skaa are descendants of the people who did not support The Lord Ruler during his rise to power, unlike the Nobles. Due to centuries of (mostly) keeping to themselves, Nobles and Skaa have basically diverged into two distinct races of humans. All skaa allomancers are the result of Noble and Skaa blood mixing during some point in the person's heritage.
Physically, the Skaa are of average human traits.
Culture
While not technically slaves, because by law they are not property of their masters, in practice this is quite the opposite. The skaa are the beaten down, oppressed working class, and because of this many are timid in regards to the nobles. Skaa generally keep to themselves, and a large number turn to a life of crime to sustain themselves.
Those who are not criminals are worked to near death in some situations by their masters.
Skaa maintain a fear of the evening mists due to folk lore and misinformation spread by the nobles.