Shas'O Kais

The leader of the Tau forces on Kronus in Dark Crusade, he plans to liberate the entire planet from the other six races. Using a XV22 Battlesuit like the Tau Commander Shadowsun, he is at first only equipped with a Burst Cannon in his right hand, but later in the game, at full weapon capacity, he carries a Fusion Blaster (replacing the Burst Cannon), subsequently replaced by a Plasma Rifle, a Heavy Flamer in his left hand and Missile Launchers mounted on each shoulder. He also wears Iridium armour and can be equipped with a Cloaking Field and a Jetpack and an Advanced Sensors Array to help him detect stealth units. A Shield Drone and a Gun Drone can accompany him when they are earned in the campaign.

When his Tau Strike Force finishes off the other seven races in Dark Crusade, the Tau colony on Kronus is slowly revitalized as more Tau begin to move in from other worlds. Humans that fought against the Tau are placed in single gender re-education camps and are treated like second-class citizens. Apparently the Tau are also enacting some sort of sterilization policy to prevent human reproduction - as the human population starts to dwindle very rapidly as the Kronus colony begins to thrive.

Though there is no evidence to directly support or deny this fact, it is worth noting that he shares the same name as the Tau protagonist from the game Fire Warrior, and may indeed be the same Kais; however, it is also worth noting that "Kais" is the Tau word for "skillful", and it is itself a common name in the Fire Caste.