Tilam

Tilam are an ancient sapient species that travellers the stars, living onboard massive starships that are part colony ship, part warship. Hailing from an unknown planet, the tilam were forced to undergo their exodus after being infected with a biological weapon that devastated their species.

Biology
Tilam appear to share a similar evolutionary history as that of humans, being descended from their own homeworld's primates. As their homeworld was heavily enriched in silver, the average tilam appear similar to humans who possess the the skin condition known as Argyria, but have since evolved to become a varying degree of purple, gray, and blue.

Infected with a time-delay virus, it is incredibly effective in its method of infection which are still unknown. As an effect of the biological warfare, the tilam are incapable of staying within the atmosphere of any known celestial body for more than a few hours, requiring a special enzyme to be filtered in the air for their health to remain as it is.