SWTOR Nar Shaddaa (Empire) Blue Mastery Datacron Location Guide

The Blue Mastery Datacron increases your aptitude in combat, allowing you to do more damage. It will grant you Mastery +3 to your permanent stats along with codex: Galactic History 33: Dromund Kaas. There are 5 Datacrons in total located on the planet of Nar Shaddaa.
Note: You can collect them on either Imperial or Republic Side as they count towards the same achievement.

Datacrons are collectables scattered around the galaxy in Star Wars: The Old Republic. Each Datacron contributes towards your Legacy's passive stats permanently. Furthermore, they also provide interesting Lore and Codex Entries about the Old Republic era.

Starting coordinates: -3798, -1673.

This Datacron is located high up on a platform in the Krayt Gang Territory in the Corellian Sector. This has a few semi tricky jumps, but if you can be patient enough, it'll be easy.

Climb the weapons crates and further on top of the shelves.

From the last shelves, jump on top of the roof of the "bus stop".

From here you might have to wait for the floating kiosk coming from the left.

The kiosk will float really close to your position, so don't try to jump too early. Jump to it as soon as it's positioned directly in front of you.

As soon as you jump on top of it, move around just a little bit, just so the engine recognises you standing on a moving platform. Other than that, enjoy the ride to the top. It will take approximately 5 min.

When you get close enough to the platform with the Datacron on, move to the side of the kiosk, so you face the wall. When you are directly above the platform, or when you feel comfortable enough, jump off. I do not recommend walking off, since you can risk gliding off the wrong way and miss the platform.

This will grant you Mastery +3 to your permanent stats along with codex: Galactic History 33: Dromund Kaas.

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:

Once an outpost of the ancient Sith Empire, the planet Dromund Kaas now presented a refuge to the Empire's weary survivors after their long exile from Korriban. Upon landing, the Emperor addressed the populace, promising them that from this world, a new civilization would grow to eventually crush the Republic.

The challenges of colonizing such a wild planet were soon evident. Dromund Kaas's jungles were untamed, full of dangerous predators. To ensure order and discipline, military service became mandatory for non-Force sensitives. Imperial citizens took pride in this duty, knowing they were defending the future of their people.

Before withdrawing into isolation, the Emperor established a Dark Council to oversee the Empire and control the hierarchy of the Sith. He is said to have conducted many dark side rituals and experiments that affected the planet itself, leaving Dromund Kaas storm-wracked to this day.