Sensing this weakness, the warlike Mandalorians began a series of brutal attacks against worlds throughout the Outer Rim. In desperation, the Republic turned to the Jedi Council for aid. The learned Masters wanted to proceed with customary caution and due care before embarking on a long and destructive military campaign; however, more immediate help came in the form of two young Jedi Knights named Revan and Malak.

Ignoring the dictates of the Jedi Council, the charismatic pair recruited many to their cause, rallying the impulsive youth of the Order with cries of victory and glory. With Revan and Malak at the head of their great fleet, the Republic set forth to drive the invaders back. The Mandalorian Wars were long and bloody, and many Jedi perished in the struggle. Yet, at its end, the Republic emerged triumphant, and Revan and Malak were hailed as heroes.

But the heroes did not leave the war untouched; something about the Outer Rim worlds twisted and corrupted them. On Korriban, Revan uncovered the lost secrets of the Sith and became the heir to an ancient and evil legacy. Succumbing to the lure of the dark side, the fallen Jedi assumed the title of Darth Revan, Lord of the Sith. Malak was chosen as the Dark Lord's apprentice, and the great fleet under their control abandoned the Republic and swore fealty to their new Sith masters.

With their army of followers, Revan and Malak returned not as saviors, but as conquerors. For two years battles raged on the perimeters of Republic space. The Sith gained victory after victory, until the Jedi set a trap for Revan and succeeded in destroying the Dark Lord. But during the chaos of battle, Malak managed to escape.