Endurance +2 (X: -32, Y: -36)
Enter the cave in picture / map (coordinates -26, -30)...
...and follow the passage to reach the datacron.
Willpower +2 (X: -641, Y: 35)
Enter The Ruins of Kaleth and enter the collapsed building in the picture / map above (-598, -9).
Inside, run up the fallen pillar, then the next pillar. This leads straight to the datacron.
Blue Matrix Shard (X: -94, Y: -93)
You’ll need to go to the southwest area of The Forge Remnants and head along the path shown above (see map for location, coordinates -170, 86).
Follow the path until you reach the second level of the collapsed building.
Jump down toward the enemy encampment, and you’ll see the datacron on the ledge to your right.