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Originally posted by Brachaesnethar
One could view it that the dark side is SO powerful that the mere frail human form cannot contain the raw power that the dark side users channel... I know looking THAT bad would be a serious detracting point for me... what good is being evil if you have to look so hideous?  |
That's actually kind of the view that Star Wars stuff takes. Basically, anyone who uses the Dark Side intensively gets deformed (see Courtship of Princess Leia and the force witches within). Also, use of too much dark side energy does weaken the body- the Emporer really is that weak, and not because of age, as he has a tendency to switch bodies (see Dark Empire, Dark Empire II, and Empire's End comic series).
It should be noted that all kinds of Sith lords have a tendency to remove their spirits from their bodies at death- Exar Kun is one (show up about 7 years post-Endor). In Jedi Knight:Jedi Acamdey, Marka Ragnos is another one. So the Emporer's power to remove himself from his body isn't unique, just his ability to transfer to other bodies.
Regardless, the Dark Side probably wouldn't be able to destroy someone's face like that. It's probably a battle wound.