Hey, Jester, you can start bringing Darth Sion and Nihlius into this but they don't appear to anyone yet. Not Revan, not Alek, not the Kovasn, not Thor, not the Republic... not anyone. Just somewhere off torturing poor people, etc, etc.
But I'm gonna bring in a new character... a new Dark Lord.
Gentlemen... may I introduce Darth Mortis, Lord of Fear.
Gender: Male
Age: Unknown... a great Sith Lord at the time of the Hundred-Year Darkness
Appearence: Here's a image so you can picture sorta what his body looks like
^ From the previous picture I'm sure y'all can use some imagination and come up with a... scary face for him. 
But since the darkside has corrupted much of his features he wears a mask most of the time resembling something like this.
History: Unknown
Species: Unknown... at least half human
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Rotel: (growls)
(through the Force to Thor) After the witch tastes her death at my hand I will not spare you the same punishment. My face will be the last thing your pathetic eyes ever see.
(heads towards the Core)
...Malachor V, Core...
Ashni: Rotel is a willing vessel. His mind is tainted... undecided. He fights for the Jedi but- (she smiles) he can be easily broken.
...Malachor V, near the Core...
Daar: (growls)
More Dark Jedi up ahead.
(he looks at Revan)
I will take care of them, mi'lady. You move towards the Core. I fear that we may already be too late.
...Malachor V, Core...
*A figure cloaked in a black robe circles Lori, the sound of its boots hitting against the floor echoing throughout the Core. Lori lies on the floor; hurt, bleeding, too weak to move. The figure stops in front of her face, some five feet away so she can see it clearly. It removes the hood of its cloak reveiling a horrid mask. It speaks to her in a deep, raspy voice.*
She thinks she can hide her plan from me... thinks she can betray me. (chuckles)
*It steps closer, squatting in front of her. It grabs her by her chin and lifts her face so her eyes meet its masks hallow black ones.*
You have so much potential. The Force is indeed very powerful within you... but she plans to use that against all of us. Against me.
*It pauses, searching her eyes.*
I can give you such power, Jedi... that you could rule the galaxy, crush everything in your path with only the slighest lift of your hand... if only you would yield to me.
*Lori stares into the figure's hallow eyes. mesmerized as she sees within their darkness visions of conquest.*
...Malachor V, near the Core...
Kilax: (growls, bearing down his weight against Marx's lightsaber)
*He manages to use Force push, pushing Marx down the hall. He then turns using the Force to bring in the walls, trapping Xvan and Akson so they can't reach them.*
Kilax: (turns, smiling)
Let's see how you fight without your bodyguards, Jedi.
...Malachor V, near the Core...
Akson: (sighs, shaking his head) Should have seen that coming.
Xvan: (uses the Force, straining to move the walls back in place)
Damnit!
Akson: How come we always end up getting stuck somewhere?
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Wow... anyone notice that the way we type in Cratus's RPG is much more fun that the "Person:" and the "(she did this)".