Force harmony Force harmony was a light side Force power that allowed several Force - users to join their Force energies together in a pure and powerful manifestation of the light side . Bathing them in light side energies , the ability protected users from dark side powers and could sever opponents from the dark side entirely . Luke Skywalker , Leia Organa Solo , and the unborn Anakin Solo used this ability to separate the reborn Emperor Palpatine from the dark side , causing the Force storm he had summoned to go out of control and consume him . Description . Force harmony was a Force ability that allowed several willing Force - users to manifest the power of the light side . Once in effect , it bathed the users in the illumination of the light side and could act as a shield against dark side powers . The power could be kept up almost indefinitely , although a slight strain was put on whoever initiated the technique . For the duration that the ability was in use , the users would be united by the Force in all its intensity . The energies of the light side would flow through them in waves and give them complete clarity in the Force . The initiator could only link as many other Force - users to the chain as their Force energy allowed . The power could not cancel out the dark side , but it could distract its practitioners and make their actions more difficult to perform , and in some cases cut them off from the dark side completely . Force harmony could also interrupt dark side abilities already in use by engulfing their users in waves of light side energy ; those powers inherently difficult to control , such as Force storm , were especially susceptible to this interference . Proximity between users in the chain , strength in the Force , and blood relation were all factors that could affect the intensity of this ability . In order to begin Force harmony , the initiator had to be adept in Life Sense and telepathy . Relatively powerful Derriphan s , creatures of the dark side , could be defeated by a group of Force - users in a Force harmony chain by transferring light side Force energy to the creature . Applications . After Emperor Palpatine resurrected himself in a clone body , he brought the Jedi Knight Luke Skywalker to the dark side and trained him as his apprentice . Skywalker ' s twin sister , Leia Organa Solo , traveled to Palpatine ' s flagship , the " Eclipse " , and brought her brother back to the light side . Once Palpatine summoned an incredibly destructive Force storm to annihilate the New Republic fleet at Pinnacle Base , Skywalker and Organa Solo brought their Force energies together and enveloped Palpatine in a wave of light side energy . Augmented by their twin bond and the strength of Organa Solo ' s third child , still in the womb , the twins were easily able to cut Palpatine off from the dark side , causing him to lose control of his storm . The storm consumed Palpatine and the " Eclipse " , but not before Skywalker and Organa Solo escaped the doomed ship unharmed . Users . Several Jedi Knights and Masters of the Old Jedi Order , such as Ood Bnar , Arca Jeth , Thon , Vima - Da - Boda , and Yoda possessed the ability to initiate Force harmony . Additionally , the ancient Dark Lord of the Sith Freedon Nadd , a master of both Jedi and Sith abilities , could conduct Force harmony . Elite members of the Emperor ' s Shadow Guard led by Inquisitor Valin Draco were also known to possess the ability . Leia Organa Solo first learned of the ability from the Tedryn Holocron . The holocron ' s gatekeeper , Bodo Baas , told her of a prophecy related to him by his Master almost a thousand years ago , which predicted that Skywalker and Organa Solo would defeat Palpatine together . Organa Solo realized the meaning behind the prophecy after confronting Palpatine on the " Eclipse " , and joined her Force energy with Skywalker ' s . Skywalker , too , realized that the only way to combat Palpatine ' s dark side energies was through pure light and joined his sister . Combining their powers with Organa Solo ' s unborn child , Anakin Solo , the twins were able to vanquish Palpatine . Behind the scenes . Force harmony first appeared in the of the " Dark Empire " comic book series , written by Tom Veitch and illustrated by Cam Kennedy , and was referenced in the issue ' s endnotes . It was later named and given an expansion in Michael Allen Horne ' s " Dark Empire Sourcebook " and made an appearance in the audio adaptation of " Dark Empire " . " The Official Star Wars Fact File 125 " incorrectly describes this ability as a " storm of light - side energy , " mistaking it for the Force storm that destroys the " Eclipse " . A similar Force ability , referred to as Wall of light , appears in the and issues of " " . Much like Force harmony , Wall of light combines the powers of numerous Force - users to envelop a target in light side energies and cut them off from the dark side . Unlike Force harmony , if enough Force - users are present in the chain , Wall of light has devastating physical consequences on the area it is used and can trap a dark side spirit in a specific location .