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A new holorecord in the Jedi Archive tells the story of the Sith Empire’s surprise Imperial military’s carefully orchestrated assault which put the Republic at a disadvantage for the duration of the conflict.
BTC 28 – Centuries after being driven into exile, the Sith Empire returned from deep space to launch the most calculated military assault in Republic fleet was forced to scatter, allowing the Sith Empire to sweep through most of the Outer Rim without further challenge. The Empire’s initial victories put the Republic at a disadvantage for the duration of the Great War.
Watch the sixth Timeline holorecord, Onslaught of the Sith Empire, narrated by actor Lance Henriksen.
You can also a high resolution version of this video.The video mentions a couple of planets we haven’t heard before (which isn’t to say that those will be in the game). To quote Darth Hater:
We noticed a few more planets mentioned, specifically in the Tingel Arm sector: Belkadan, Sernpidal, and Ruuria. A green planet is shown, referred to as located in the Sluis sector of the Outer Rim. We think this is Sluis Van.
And the video even more sets up the Sith Emperor as a big bad.