i'm not sure, but you might mean Sith Lord...Jester loves that one too
i also noticed lately that the Watchman/Assassin are the two most underused Prestige classes. for the most part, most of the people i know use Jedi Masters/Sith Lord or Weapon Masters/Marauders...and as i pride myself on being different, i've chosen Watchman B)
"That which blocks your ears is worthless fear. The enemy is one, you are one. What is there to fear? Cast off your fear. Look forward! Go forward! Never stand still. Retreat and you will age. Hesitate and you will die."-Zangetsu Tensa