The Sixth Line is a two-part short story published in the developer blog for Star Wars: The Old Republic. The story introduces the Sixth Line, a militant faction of the Jedi Order that appeared in the update for the story arc of Ziost.,
While the bulk of the story happens during Chapter One of the video games storyline, the epilogue is a lead-in to Game Update 3.2: "Rise Of The Emperor".
The story can be read at the following links:
https://www.swtor.com/info/news/blog/20150424
https://www.swtor.com/info/news/blog/20150428