Force harmony
From Wookieepedia, the Star Wars wiki.
Force harmony was a light side Force power. It was used to combine the powers of several willing Jedi to create and manifest the power of the light side of the Force.
As long as it was sustained, it bathed the users in the celestial illumination that is the light side, which acted as a shield against the powers of the dark side of the Force. It was also used to resist other powers used by dark side followers, as well as interrupt any dark side powers being used nearby.
