Varesh Shai was a Yuuzhan Vong originally from the Warrior caste. He was a member of Domain Shai, whose members were especially known for their devotion and enjoyment of pain. After his Domain was dishonoured by Shedao Shai's failure at Ithor, Varesh became determined to regain favour with the gods and fanatical in his devotion to the True Way.
Near the end of the Yuuzhan Vong War, his fanatical loyalty saw him chosen to participate an experimental escalation ceremony to become one of the Slayers: a new caste of warrior-priests specially created to combat the Jedi Knights; but whose existence some members of the Elite feared was heresy and a violation of the True Way.
At the conclusion of the war, he ignored Nas Choka's call to surrender, denouncing the Warmaster as a heretic. Varesh declared himself the new Warmaster and withdrew to Wild Space together with the Slayer's Sword, a Uro-ik v'alh battleship that served as his command ship, to continue the fight, refusing to accept the Supreme Overlord had died and executing all who dared to question his continued devotion to the True Way.
Trivia
Varesh will feature in an upcoming Clan Naga Sadow competition later in Summer 2009.