When Darth Vader led the 501st Legion to massacre the Jedi Order in 19 BBY during Operation: Knightfall, the Jedi Temple was partially destroyed. The Jedi Trials Chamber remained damaged, but intact after the raid.
Galen Marek was sent by his master—Darth Vader—to the Jedi Temple to continue his Sith training. He infiltrated the Temple eliminating the stormtroopers that guarded the area and made his way to the Trials Chamber where he heard the disembodied voice of his father, Kento Marek.
Upon entering the room the old Trials Program activated and the simulacrum of the Pau'an Sith Lord Darth Desolous stalked out of the shadows and engaged the apprentice in a duel. After an exhausting lightsaber fight, Starkiller used The Force to topple the statue of the Emperor which crushed Desolous to death.
- The Force Unleashed video game (First appearance)