Originally Posted by Alexrd
None. There are only two Sith.
The Force, and, well Science fantasy itself, allow Commune with many a dead Sith.
ot: I think it would be cool to see Starkiller go to Korriban in search of Answers and to stumble into the tome of Darth <insert>, although it has happened many, many Times in other games and books, so it would have to be done well to not be samey.