Is Nihilus part of George Lucas' original vision? Any Sith outside of the official Star Wars universe (inside Lucas' head) cannot not be used reliably in a ficitional versus battle. Besides, in order for any character outside of Lucas' original vision to even seem interesting, the newbie author has to make them unbelievably powerful. That's just lame.

Keep in mind, George Lucas has granted license to many books and most if not all of them he has been denounced as part of the original universe.