This Datacron unlocks the codex entry - Galactic History 65: An Exile on Rhen Var
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:
Ulic Qel-Droma had vanished into exile a broken man. His fate was discussed at the Jedi Convocation on Exis Station, led by his former lover, Nomi. As the order debated how to rebuild, Sylvar, whose mate had died in the Great Sith War, called for Ulic to be harshly punished. Her demands were refused.
After the convocation, Vima, Nomi's daughter, sought Ulic out on Rhen Var and asked him to train her as a Jedi. Although reluctant, Ulic agreed for Nomi's sake. Bent on revenge, however, Sylvar had paid a scavenger to track Ulic down.
Sylvar brought Nomi to Rhen Var where they confronted Ulic, but Vima persuaded them to forgive him. The scavenger, Hoggon, had other ideas and shot Ulic in the back. Ulic's body vanished into the Force, allowing the Jedi Order to finally focus on healing.
Coordinates 1039 , -1245
This Datacron is located in eastern Hoth in the Glacial Fissure area. It is in the far northeastern Glacial Fissure area through a cave and up ontop of a hill. The cave you need to go through in order to reach this Datacron starts around 1046, - 1046 (Screenshots 1 & 2). Once you're through the cave you will want to turn left and head up the hill and over to the large satellite to the north. Head over to where I am in (Screenshot 3) and jump onto the ice ledge directly in front of me. So you'll be where I am in (Screenshot 4). Follow the northern ledges around until you run out of ledge.
You can kind of see the Datacron in the distance where you need to jump down in (Screenshot 5). After you drop down continue north skirting around the mountain until you reach a cave near (Screenshot 6). Go through the cave which will lead you directly to the Datacron.