The Tre'pira are the worker caste of Polaris society and, as such, the largest in terms of scope and population. They are distinguished by their white robes. The headquarters of their caste is located on Tre'ar Pira in the Tre'pirana system. The Polaris caste system typically puts the Tre'pira very high in the social hierarchy, as they are often seen being treated with great respect by other caste members.