Actual concentrated lightning

And when Vader forced Starkiller onto his back foot and raised his lightsaber to strike him down, Starkiller fired a lightning blast into the side of Vader's armor that was so concentrated, even the new insulation couldn't absorb it.

The Dark Lord stiffened, betrayed by his extensive prosthetics. The distraction lasted only a moment, but it was enough. Starkiller knocked his blade out of the way and moved in to strike.



The Force Unleashed 2, Chapter 1