Dark side of the Force

The dark side of the Force, called Bogan or Boga by ancient Force-sensitives on Tython, was an aspect of the Force. Those who used the dark side were known as either Darksiders, Dark Side Adepts, or Dark Jedi when unaffiliated with a dark side organization such as the Sith. Unlike the Jedi, who were famous for using the light side of the Force, darksiders drew power from raw emotions and feelings such as anger, hatred, greed, jealousy, fear, aggression, megalomania, and unrestrained passion.

Pong Krell embraced the dark side after foreseeing the fall of the Jedi Order, and the rise of the Galactic Empire.