Mars WL - The "Dusts"

Concepts I did for a post-apocalyptic RPG set on Mars.
Here are former colonists of Mars who were not in shelters during the cataclysm, and became mutated over generations.
They have a thick hardened skin like rock; I wanted them to look like lepers, with skin disease because of the sun radiations. They are tougher than other humans but live a shortest life.
They're used as slaves to do menial & lethal tasks under a murderous sun, such as building railroad tracks & shadow paths.
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