Alderaan Presence Datacron Location
This Datacron unlocks the codex entry - Galactic History 45: The Krath Cult
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 Jedi know only too well, evil can arise from the most unlikely of sources. In the years after the Great Droid Revolution, two aristocrats, Satal Keto and his cousin Aleema, came to power in the Empress Teta system. Bored and spoiled, they became interested in the secrets of the Sith. They and their friends formed a Sith cult named Krath.
But Satal and Aleema began to crave real power. During a visit to the Galactic Museum on Coruscant, they spotted a book of ancient Sith lore and rituals and decided to steal it.
Once they had the book, they realized it was written in a long-forgotten Sith language. But Satal learned of the planet Onderon, once ruled by the Sith Lord Freedon Nadd, and the cousins left to unlock the book's secrets there.
How To Retrieve This Datacron
This is another extremely easy Datacron to get. In fact all it really requires you to do is ride a Thranta (the big white thing) up to the Datacron. The Thranta that you need to ride can be found around - 406 , 111 (Screenshots 1 & 2). Once you right click the Thranta it will fly you up to the Datacron's location (Screenshots 3 & 4). Once up here grab the Datacron, as simple as that.
Picture of the Thranta that you need to ride up to this Datacron.
Location on the map of this Thranta.