A Grey pupil undergoes a physical and mental trial administered by his mentor to demonstrate his alignment with the right path of the Force, which is distinct from both the Jedi and Sith traditions.
The Greys are a new order of Force masters in the Star Wars universe. Being neither Sith nor Jedi, they claim to walk the right path of the Force. For this path, Grey mentor Yalda subjects his pupil Noru to a special test in which lightsaber skills and knowledge of the Force are tested. Yet, it is the pupil who unravels an ancient legend of the Force.—Apostrof Cinema