The expansion's storyline takes place on the planet of Manaan, and sent players headfirst into a new military campaign with the mission of securing a very important planet for their faction. The narrative centers on Darth Malgus. The level cap was raised to 80. There will be new missions to take on, including a Flashpoint set on the remote planet of Elom, in addition to a new Operation that players will need to complete.
In June 2023, BioWare handed off maintenance and development of Star Wars: The Old Republic to Broadsword Online Games. The majority of the Old Republic development team at BioWare was intended to join Broadsword to continue to work on the game.
The Sith Empire has invaded the ocean world of Manaan to acquire its mass-produced kolto to turn the tide of the war in their favor while fending off Republic forces aiding the Selkath Resistance to put an end to the Empire's schemes. Elsewhere, the rogue Sith Lord Darth Malgus has finally surfaced on Elom to enact his mysterious plans.
With Malgus defeated, the time has come to uncover his plans, beginning with the mysterious Darth Nul and her dark legacy. Meanwhile, Sa'har Kateen tracks down her brother Ri'kan, and Shae Vizla contacts the Alliance on her newfound discovery.
Shae Vizla rallies her forces, alongside the Alliance Commander, to launch a full-scale offensive on the Hidden Chain's base of operations on the planet of Ruhnuk to take down Heta Kol.
Darth Rivix and Tau Idair uncover a key mystery surrounding Darth Nul which eventually reaches the Alliance Commander. Shae Vizla demands an audience with Darth Malgus to understand of any connection between him and Heta Kol. Meanwhile, Sana-Rae has been summoned to Voss only learn about a terrible prophecy surround Darth Malgus.
Field Marshal Heta Kol has the Hidden Chain has struck numerous places in the galaxy to help her utilize Darth Nul's holocron for her nefarious purpose. Meanwhile, Arbiter Jekiah Ordo requests the aid of the Alliance Commander on Ord Mantell where an unexpected ally and a dangerous secret are revealed that threaten the entire Mandalorian conflict.
The Old Wounds expansion provided new story missions and a return to the planet Voss, including a new flashpoint called the "Shrine of Silence". Old Wounds also updated the PvP system and added some economic balance changes.
Aside from the new storyline, this update continued Lane Vizla's storyline that was introduced in Showdown on Ruhnuk as well as introduced a new area on Ord Mantell known as Kessan's Landing, a new daily area and world boss: FR3-D0M. The update also introduced a revamp to the Galactic Trade Network and a new character lighting tool for cinematic content.
The Desperate Defiance expansion provided the modernized appearance for the planet Hutta and a new venture system for players who have fully completed Lane Vizla's storyline. Desperate Defiance also introduced a new seasonal event, the Dantooine Spring Abundance Festival.
On November 18, 2021, it was announced Legacy of the Sith would be released on December 14, 2021. A few weeks later, on December 7, a delay was announced by Project Director Keith Kanneg, with the game to be pushed back to February 15, 2022. The cinematic trailer, titled Disorder, was released alongside the expansion and serves as a trailer for Legacy of the Sith.
- Game Update 7.0: Legacy of the Sith — Released on February 15, 2022
- Game Update 7.1: Digging Deeper — Released on August 2, 2022
- Game Update 7.2: Showdown on Ruhnuk — Released on December 13, 2022
- Game Update 7.3: Old Wounds — Released on June 13, 2023
- Game Update 7.4: Chains in the Dark — Released on December 5, 2023
- Game Update 7.5: Desperate Defiance — Released on May 27, 2024