Shas'O Or'es'Ka, of the Fal'Shia Sept, is the leader of the Tau Fire Caste strike force sent to the Kaurava System. He seems less merciful than Shas'O Kais, who led Tau forces during the Dark Crusade. This is attributed to his attempts to use a new strategy that deviates from the traditional Mont'ka and Kauyon techniques; known as Great Strength, Great Strike. If Or'es'Ka succeeds in colonising the Kaurava System, the Tau commanders consider implementing this tactic in standard Tau warfare. The Tau used a secret, but heavily fortified moon base named Nan Yanoi that was armed with the formidable Ar'Ka Cannon as a stronghold from which to launch all their operations in the Kaurava System.