When the Mandalorian Wars ended and Darth Revan, the new Dark Lord of the Sith, and his apprentice, Darth Malak, formed a new Sith Empire, Sion became a Sith Lord of Revan's empire. Yet this one was not to last either. Sion was shocked, as Revan, redeemed by the Jedi Council, succumbed to what Sion saw as weakness and betrayed the Sith. Malak was killed by his old master and, with his death, the Empire came apart. Sion was at the Sith Academy on Korriban in its final days, and he watched as the Sith turned on each other. Sion survived this bout of backstabbing, though. With the disintegration of the Empire, a number of Sith Lords declared themselves to be warlords of their own domains, while other remnants fled for the Unknown Regions. There were other Sith Lords at work in the galaxy with their own plans. One was Revan's former Jedi Master, Kreia, who had taken the name Darth Traya. Traya, searching for "wounds" in the Force, found Sion and another Sith Lord, Darth Nihilus, the Lord of Hunger. Sion, Traya, and Nihilus allied into the secretive Sith Triumvirate, based out of Malachor V, their goal was the annihilation of the Jedi Order and restoration of the Sith to power. Traya became the master of both Sith Lords, and Sion learned much from her. At Trayus Academy, a hidden Sith stronghold on Malachor V, Sion learned more of pain. There was discontent among the Triumvirate, though. Sion and Nihilus had ambition beyond that of Traya, and their fragile alliance, united solely by a hatred of the Jedi, grew strained. Sion, furthermore, grew tired of Traya's instruction, the abstractness of her teachings and the way her words seemed to echo in his skull. Eventually he and Nihilus conspired to remove her. While Traya meditated in the academy's core, Sion and Nihilus closed in on her. Sion beat her mercilessly, the two sapped her energy before Nihilus stripped her of the Force, and Traya was cast out.