Mission to Belsavis (Emperor's ritual crisis)

During the Second Great Galactic War, both the Imperial forces clashed for control over Belsavis. The Imperials, led by Executor Krannus, attempted to commit genocide so the Sith Emperor could initiate a ritual. Unbeknownst to all but a few, the Sith Emperor was trying to commit genocide to initiate a ritual that would destroy all life in the galaxy to make him supreme. This conflict ended when the Hero of Tython, aware of the Emperor's plans, emerged.

Prelude
After the failed attempt to capture the Sith Emperor, the Hero of Tython was put under mind control to serve the Empire. Breaking away from the mind control, the Hero was saved by Lord Scourge, who declared allegiance to the Hero. Revealing the Emperor's plans to commit genocide on Belsavis to destroy life in the Galaxy, Scourge told the Hero to go to Belsavis to prevent the genocide.

The Battle
The Imperials were the more powerful force on the planet, and despite the resistances, were on the verge of committing genocide. The intervention of the Hero of Tython prevented this, however.

The Hero of Tython slew numerous Imperials in order to reach the commander, Executor Krannus. After slaying Krannus, the Hero saved Belsavis (and the galaxy) from destruction. Despite many losses, the Republic was triumphant in taking

Aftermath
The Hero of Tython was informed that one of the Jedi that had fallen with the Hero aboard the Emperor's space fortress, Leeha Narezz, was now active. Defeating Narezz, the Hero redeemed the fallen Jedi as a Jedi Knight once again.

The Hero of Tython would continue on to stop genocide on two other planets, and defeated and redeemed the other two Jedi that had fallen with Narezz abaord the Emperor's fortress&mdash: Warren Sedoru and Tol Braga&mdash: this would weaken the Emperor more than ever, who was quickly defeated by the Hero of Tython shortly afterwards.

Unbeknownst to all but a few though, the Sith Emperor had not been slain; merely his voice was. The Sith Emperor was defeated and wounded however, to the point of physical (but not mental) slumber.

Appearances

 * Star Wars: The Old Republic