This Datacron unlocks the Codex Entry - Galactic History 34: The Discovery of Ryll
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:
In the years after the Great Hyperspace War, a discovery was made on the Twi'lek homeworld of Ryloth--the spice called ryll. Ryll was a component in several medicines, but was also a powerful stimulant. Sensing opportunity, Neimoidian traders quickly gained a monopoly on ryll and were keen to introduce it to other species.
One of these species was the Porporites, a peaceful people who had recently made first contact with the Republic. But in contrast to other species, ryll drove the Porporites into homicidal fury. Eventually, the entire species was composed of raging maniacs who began attacking other worlds.
Alarmed, the Republic asked the Jedi to take action against the Porporites, but the intervention was unsuccessful. The Neimoidians, fearing for their livelihoods, decided more desperate measures might be necessary and turned to Gank mercenaries for help.
Coordinates: X 1959 , Y -1591
This Datacron is located in the High Security Sector of Nar Shaddaa. To get here fly to the Lower Industrial Sector in southwestern Nar Shaddaa and make your way through the Imperial Intelligence Gadget Warehouse. In the southeastern corner of the Warehouse you'll find an elevator that says "Systech East Elevator" (Screenshot 1). Take this elevator to the High Security Lockdown section. Once in the High Security Lockdown area make your way south to the Prison Yard area (Screenshots 2 & 3).
Where I am standing in (Screenshot 3) is where you will need to start your Datacron hunt. The location of where I am on the map can be seen in (Screenshot 2), if you're having difficulty finding it. From where I am in Screenshot 3 you will want to jump up onto the crates directly in front of me and follow the ramp up to the Catwalks. Once up here make your way northwest until you reach a computer terminal that says "Elevator" (Screenshots 4 & 5).
At this terminal choose the Incinerator Room option. Now in here you have to be quick since you'll be taking fire damage the entire time. I recommend reading this paragraph before even entering so you know exactly what needs to be done. Alright so once you're inside the Incinerator Room you need to jump down to the floor and run straight ahead to the Computer Terminal (Screenshot 6). At the terminal you must pick the correct code to open the door in front of you and reveal the Datacron. The correct code is 326:3827. It is the second code on the list.
After you acquire the Datacron make sure to access the Old Prize Machine right next to it. This will give you an item called Slot Decoder which is required for another Datacron coming up. Be sure to put this in a safe place in your inventory as it can be accidentally vendored!!!! To exit this area use the terminal to the north and follow the long hallway up and around back out to the High Security Sector.
Picture of the Old Prize Machine and the Cunning Datacron again. Do not forget to get the Slot Decoder from the Old Prize Machine. It is required for the Yellow Matrix Shard.