The Judicator Caste was a collection of protoss tribes, acting as leaders and statesmen of the protoss. The other two castes were the Templar Caste (the warriors) and the Khalai Caste (the workers). The Judicators, descended from the first tribes to join the Khala at the end of the Aeon of Strife, were selected by Khas and his students to act as leaders. Before the outbreak of war with the zerg, the Judicators controlled protoss society for thousands of years, often through the use of subtle psionics.