Dark Jedi was a term used to describe a type of individual who practiced the dark side of the Force, but was not a Sith Lord. Asajj Ventress, a dark assassin and apprentice of Count Dooku, was considered a Dark Jedi.
Behind the scenesEdit
In the official Star Wars canon, the term Dark Jedi was first used in the "Classic Moment" article of Star Wars Insider 155, which was published in January 2015. The article featured Asajj Ventress and her duel with Ahsoka Tano and Luminara Unduli aboard Tranquility, referring to Ventress as a Dark Jedi.