This Datacron unlocks the codex entry - Galactic History 10: The Tion Cluster
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:
As the Core Worlds began to expand, another power in the Core was rising. The Tion Cluster, inhabited by the descendants of ancient sleeper ship crews, had developed a new hyperspace beacon technology based on fragments left by the Infinite Empire--far superior than the hyperspace cannons previously in use.
The Tion Cluster was gradually conquered by an arrogant and powerful pirate prince, known to history as the despot Xim. Using the new hyperspace technology, he despoiled world after world, taking slaves and ruthlessly expanding his territory. His rule of the Tion Cluster lasted for thirty years and saw the conquest of hundreds of thousands of planets.
Xim might have continued his rule unchallenged even longer, but he chose to expand his empire into a new area of space, one already inhabited by the powerful Hutt Empire.
This Datacron is located on the western side of the map in the Ruins of Kaleth. You can find the Datacron on the hill at the base of a statue around X: -640, Y: 36. Despite the location of the Datacron, the path you want to take to locate it begins at X: -648, Y: 4. You will be using the knocked over column here to climb up and into the Upper Kaleth area. If you're having difficulty with this use the little sliver of pillar to reach the Datacron, ignore the large chunk at the top. From here the path should be clear on how to reach the Datacron, if it is not use my screenshots below as a guide.