Ssi-Ruuk
A Saurian species split into castes, based on the colour of their scales.
Blue scales represent the noble caste, who form the Imperium's aristocracy.
Gold Ssi-Ruuk belong to the religious caste, while
Yellow are scientists and engineers, and
Red are the military.
Green Ssi-Ruuk form the labour/worker caste, which is the largest but has little prestige.
Brown Ssi-Ruuk are the lowest of the low, resulting from Ssi-Ruuk from different castes breeding togethe. There are also
Black Ssi-Ruuk, who are extremely rare, and are trained as expert assassins.