This Datacron unlocks the codex entry - Galactic History 62: The Great Sith War Ends
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:
The death of Exar Kun and Ulic Qel-Droma's redemption had scattered the cultists of the Brotherhood of the Sith--but the Mandalorian armies that also served would not give up the fight. The Republic forced the Mandalorians to the Onderonian moon Dxun, where Mandalore was devoured by wild beasts. The Empress Teta system was reclaimed next, and the last vestiges of the Sith cult fled to the Outer Rim, leaderless.
The Jedi Order had suffered many losses in the Great Sith War, but none was felt more keenly than the destruction of Ossus, which had been the order's home for generations. The Jedi had lost their libraries and precious artifacts and needed to rebuild. After much debate, the Jedi Order moved its headquarters to the temple on Coruscant.
This Datacron is located in far southeastern Labor Valley through a Holographic Door. You will want to head over to where I am on the map in (Screenshots 1 & 2), here you will see a faded Holographic door which you can run right through. Once you're through the door either kill the droids in the hallway or just run by them all, you can leash them by the time you reach the Datacron so it isn't a requirement to kill them at all. Follow the hallway to the end and you will come out to a large square room where you will find the Datacron harmlessly sitting atop a crate.