Galactic History 13: The First Great Schism is a codex entry found within the Achievements: Datacrons section of a player's codex once it has been unlocked. It can be earned on the planet Ord Mantell and provides a brief background on certain events that would ultimately lead to the founding of the Galactic Republic.
|“||This datacron holds unheard of power and knowledge collected by an ancient race. You access its power and discover writings which are clearly only one small piece of a massive galactic history:"
"After the Force Wars, when the Jedi Order learned of the destructive power of the dark side, the Jedi devoted themselves to the path of the light. In the early days of the Republic, a young Kashi Mer Jedi named Xendor defied the order’s code and began experimenting with dark side techniques. Incensed, the Jedi Order confronted Xendor and banished him from Ossus."
"Xendor, now immensely powerful and full of rage, raised an army on the planet Lettow and led it against the Jedi. Not since the Force Wars had the Jedi fought their own. Xendor and the Legions of Lettow eventually fell in battle; his lover, Arden Lyn, was defeated by the Jedi Master Awdrysta Pina and placed into a strange stasis, sustained by the dark side. Although this first schism within the Jedi was over, it would not be the last.
|~ Star Wars: The Old Republic, Galactic History 13: The First Great Schism codex entry|