In the Force Unleashed (PC, PS2, XBOX 360 versions), Vader raises his arm at a horizontal angle when he is attacked by Sith lightning and this is sufficient to block it fully. It is said that having mechanical arms, he would not be able to do such a thing. What could he have possessed in order to put up such an effective defence?
I fought on the battlefield. I retired to embrace a life of discovery and profit. I carve my own path in life and am better for it.