The force lightning itself is perhaps the ultimate embodiment of the dark side of the Force. By infusing great emotions, the Sith can create devastating lightning bolts that cause pain to their victims and can even scar and warp those exposed with a great deal of power, as illustrated by Mace Windu (Samuel L.Jackson) reflects strong skill back to Palpatine at the end “Revenge of the Sith.” However, at no point in the film does Darth Vader use the Force of Lightning, though he has managed to use it while projecting his consciousness in Marvel Comics’ “Darth Vader: Dark Lord of the Sith” #25.
The real reason we never see him use this power directly is due to his general condition and health. For all intents and purposes, Darth Vader is barely alive, kept on this side of the mortal coil through a combination of the Force and his signature life-support system suit. he. At the end of “Return of the Jedi”, Luke Skywalker (Mark Hamill) receives several blasts from the ice Palpatine, but even after indirect contact, Darth Vader’s suit begins to fail. This is due to the nature of Lightning Force and its roots in electricity. That kind of output simply overwhelms and short-circuits the means by which the Vader is maintained. If Darth Vader had ever directly harnessed this sinister power, he would have personally signed his own death certificate.
https://www.looper.com/728345/why-darth-vader-cant-use-force-lightning-in-star-wars/ Why can’t Darth Vader use lightning in Star Wars