Rule of Two (Star Wars: Darth Bane, #2)

by Drew Karpyshyn

Much older legends identified Tython as the original birthplace of the Jedi Order over twenty-five thousand years before. According to the tale, priests and philosophers of the world had the ability to draw upon a mystical energy they called Ashla; a power that represented all compassion and mercy in the universe. They were opposed by a rival group that drew their strength from Boga, the manifestation of raw passion and pure uncontrolled emotion.

Ashla and Boga became more commonly known as the light and dark sides of the Force.