This Datacron unlocks the Codex Entry - Galactic History 53: The Conclave at Deneba
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 Sith Krath cult had become a menace, attempting to seize the Empress Teta system and repelling a Republic fleet. Knowing the shadow of the dark side lay over the Krath, the Jedi called a conclave on the planet Deneba to discuss their next course of action. Ulic Qel-Droma suggested a risky plan: infiltrating the Krath from within.
Many disagreed, believing such a course was reckless and dangerous. During the debate, the gathering was ambushed by Krath war droids. The Jedi rallied and managed to fight the droids off, but among the casualties was one of the Jedi's wisest Masters. Arca Jeth was dead.
Ulic Qel-Droma, Arca Jeth's student, was devastated by his death. Full of grief and hatred for the Krath, Ulic swore to destroy the cultists, not seeing that his desire for revenge was leading him down a dangerous path.
Coordinates: X 192 , Y 4
This is by far the easiest Datacron for Republic players to find on Balmorra. Really all that you need to do for this Datacron is buy a key from a vendor for 5k Credits then open the Datacron chest. Anyway let's get started. The intro area that you land at on Balmorra (Bugtown) is actually where this Datacron is located. To start, far in the southeastern end you will find a vendor named Ba'teil (Screenshot 1 & 2). From her you will want to purchase the Lost Code Cylinder for 5k Credits.
Once you have the Cylinder you need to make it back to land. I've found the best way is to run north around the mountains and circle back around. This way puts you pretty much near the Datacron anyhow. With the Cylinder in hand you will want to go to the Space Chest in central Bugtown (Screenshots 3 & 4). Using the key on the chest will open it up and reveal the Datacron for you.