Force Light



Force Light was the immense Force power used to purge a dark side manifestation from a nexus point, be it in a place, spirit, or even a person. Yoda used this ability on Dagobah. The Beast Master Thon also used this power to cleanse the world of Arkania, isolating the dark side of that world in a pond.

Source

 * Power of the Jedi Sourcebook
 * Tales of the Jedi: Knights of the Old Republic