Invasion of Ossus

The Invasion of Ossus was an operation carried out around 3630 BBY by the Sith Empire under the direction of Darth Malora, and later, under the direction of Darth Malgus. Their objective was to destroy a Jedi farming colony established by Master Gnost-Dural after the Eternal Empire's conquest of the known galaxy.

Prelude
In 3636 BBY, the Eternal Empire under led by the former Sith Emperor Vitiate attacked both the Sith Empire and the Galactic Republic. This onslaught led to surviving members of the Jedi Order into hiding. By 3632 BBY, Jedi and Sith led by the Eternal Alliance's Commander initiated a revolt against the Eternal Empire that would culminate with the death of the Sith Emperor.

Master Gnost-Dural's vision for Ossus was to help the colonists grow crops in order to better support them while Jedi Knight Tau Idair wanted to send out teams to find surviving Jedi. But this was not done so as to ensure the Jedi remained hidden from the Sith. Sometime later after the end of the war against Zakuul, the Sith Empire learned that Jedi Master Gnost-Dural was alive hiding on a Jedi farming colony on Ossus, the Empire decided to send an attack force to the planet under the command of Dark Council member Darth Malora. After the Eternal Alliance decrease of power on the galaxy and fear of an conflict with both main factions, decided to side with one and help them on Ossus.

Aftermath
After Ossus both the Republic and the Sith Empire learned that Darth Malgus had survived his supposed death above Ilum. Darth Malora's seat on the Dark Council was vacated after Malgus overtook her operation on the planet.

Behind the scenes
The choices that were made by the player in the Iokath expansion determine whether it is Acina or Darth Vowrawn who appear as Empress/Emperor in the Sith storyline. The player's class also determines which companions the player reunites with during the Ossus storyline: the Sith Warrior class with Jaesa Willsaam, the Jedi Knight class with Doc, the Jedi Consular class with Nadia Grell, and the Sith Inquisitor class with both Moff Pyron and Khem Val.

At the end of the planet storyline. The outcome for Gnost-Dural differs between factions. If the player sides with the Empire, the player will be able to take Gnost-Dural as a prisoner for Light Side points or let Malgus kill him for Dark Side points. If the player sides with the Republic, Malgus will seriously wound Gnost-Dural and be left on the Library, eventually Idair and the player will find a barely alive Dural and taken him with Doc, so he can save him.

Appearances

 * Star Wars: The Old Republic