Thanks for correcting me. I'm not really into the Star Wars novels, so I can't quote what they say in them. When I read the Potentium theory, I thought it was supported by the Legacy series (from the mention of Vergere), which is considered canon.
Chapter 12 of A Soul Adrift
: On the planet Felucia, a young apprentice of the Dark Side thinks back to the beginning of her training as she lies in wait for her prey...
All the Time
: After four years in the Unknown Regions, the Exile returns to the known galaxy to visit an old enemy.
: A master of the Dark Side finds himself about to lose the one thing he cares about--and he will do anything to stop her from endangering herself.