It continued the Fallen Empire storyline and raised the level cap to 70. A fourth expansion, Knights of the Eternal Throne, was released in December, 2016. Additional chapters were released about once a month starting in February 2016, completing in August 2016. The storyline was given an initial release of nine chapters. Set five years after the current timeline, the players are released from carbonite freezing to find both the Republic and Empire conquered by the Eternal Empire, which, as the Outlander, they must stop. Knights of the Fallen Empire, features a new plot set after the war, focuses on solo content, revamps the companion system by allowing companions to take any role necessary, raises the level cap from 60 to 65, and is available free to all subscribers. Shadow of Revan, deals with Darth Revan's return, and introduces the planets Rishi and Yavin 4, raising the level cap to 60. Rise of the Hutt Cartel deals with the eponymous Hutt Cartel's incursion on the planet Makeb and raises the level cap to 55.

The game has received four full expansions, which extend the story beyond the initial class quests. Another novel, Annihilation, takes place circa the time of the game and focuses upon Satele Shan's son. Fatal Alliance (dealing with tensions in the truce), Deceived (Malgus's story), and Revan (detailing just what happened to Revan and the Exile after the events of Knights of the Old Republic).

A series of three books serve as a prelude.

Old republic at war