During the Galactic War between the Galactic Republic and the Sith Empire, the Sith Emperor attempted to perform a dark side ritual that would allow him to consume the life force of the entire galaxy, and he sent his agents out across the galaxy in order to take advantage of the chaos and perform the sacrifice necessary to start the ritual. However, the Emperor was opposed by the Jedi Knight known as the Hero of Tython, who had broken free of the Emperor's mental control and joined forces with the former Emperor's Wrath Lord Scourge after the Sith revealed the Emperor's plans. With aid from the rest of the Jedi Order, the Republic Military, and the Hero's own crew, the Knight foiled the Emperor's agents on Belsavis, Voss, and Corellia, freeing the other Jedi under the Emperor's control in the process. After learning of the Emperor's location on the Imperial capital of Dromund Kaas, the Hero infiltrated the Dark Temple on the planet while the Republic fleet engaged the Imperial Navy above the Dromund Kaas, and in a final battle the Knight managed to strike down the Sith ruler and seemingly end the threat he posed to the galaxy.
- Star Wars: The Old Republic (First appearance)
- Star Wars: The Old Republic Encyclopedia establish that the Battle of Ilum and the end of Act III for the class storylines of Star Wars: The Old Republic occur in late 3640 BBY and prior to the events of The Old Republic: Annihilation, which is also set in 3640 BBY per The Essential Reader's Companion. Annihilation establishes that the Treaty of Coruscant collapsed approximately eighteen months prior, or in 3641 BBY, and as Act III occurs after the treaty's collapse, the act begins sometime between 3641 BBY and 3640 BBY. and
- Star Wars: The Old Republic Encyclopedia date the finales of Star Wars: The Old Republic's class storylines in 3640 BBY, and place the subsequent Battle of Ilum at the end of that same year. and