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Datacron Locations - Dromund Kaas (Empire) - Game Cannon SWTOR
A video guide to all of the Datacrons on Dromund Kaas
The same issue is present with Dromund Kaas as on Coruscant, the codex will show 5/6 datacrons and to get 6/6 you need to discover the Ancient Assembly Area. Which is where you assemble your matrix cubes.