Star Wars Jedi Knight: Mysteries of the Sith (aka MoTS) is the expansion pack for the first person shooter Dark Forces II. It was released January 31, 1998.
One of the most appealing things for fans was the opportunity to play as Mara Jade, one of the most popular Star Wars Expanded Universe characters. The story is set five years after the events of Jedi Knight. This expansion significantly improved the original Jedi Knight engine by adding aesthetic features such as coloured lighting, new enemies and force powers. There were several under-the-hood changes as well; the most significant being that COG, the programming language that Jedi Knight uses to create scripted in-game events and interactivity (doors, elevators, weapons, in-game cutscenes, enemy behaviour, etc.) was expanded with new functions and capabilities, which the Sith engine took full advantage of. Mysteries of the Sith also featured new types of multiplayer action, and included several new weapons, such as flash grenades, a seeking railgun, and a carbonite gun. Unfortunately, Mysteries of the Sith multiplayer never was as popular as Jedi Knight multiplayer because the Sith Expansion was typically sold separately from Jedi Knight and was often difficult to come by unless it specifically came bundled with Jedi Knight.

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Star Wars: Jedi Knight: Mysteries of the Sith - Official site. Includes information about the force powers and game storyline, screenshots, and downloads.
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