On an uncharted station in deep space, Cipher Nine contemplates the war. It's been somewhat quiet of late, but Darth Arho has finally picked up the hints, and launched an invasion of the ice planet Ilum. The schematics she sent should allow the Sith to find a foothold fairly easily, but the Jedi will come running to its defense. It is one of their so-called sacred sites, after all. With a little bit of prodding, this battle could be just what she needs to get them to kill each other.
"Mm. There are a few Sith that would benefit from the personal attention of a Dark Councilor. I hesitate to leave the command without making sure they won't be a problem. Give me a little while to come up with a list for you?"
Callida nods, then gets to making a list of Sith That Occlus Needs To Intimidate. It doesn't take very long; it wouldn't do for Occlus to deign to personally scare too many people. It'd be a waste of her time, for one, and it'd imply insecurity, for another. Better to instead have an exquisitely targeted small reign of carefully modulated terror. The list is short.
When she's done, she sends it to Occlus, along with corroborating explanations of why precisely each and every Sith Lord needs a Dark Councilor to show up and be terrifying at them. There's a secondary list for 'Terrifying them might help but things will not catch on fire if Occlus doesn't,' in case Occlus thinks more terror is necessary than Callida recommends.
Once the Sith-specific diplomacy's handled, they should be all set to go negotiate a ceasefire.
Occlus goes and looms at selected Sith. In the majority of cases, this is all that's necessary. Military Sith understand very well "through strength, power", and Occlus is stronger than anyone they've ever met.
Then it's off to the negotiations.
The man who claims to be Revan is present!
(And several kilometers away, so is HK-47, watching the proceedings through a sniper scope.)
Maybe-Revan waves casually at them.
As they approach, Occlus lets her control relax slightly, the tangible weight of her presence in the Force asserting itself in the area. Not the threatening posture she used with the recalcitrant Sith, simply a declaration of the level of person the Jedi are dealing with.
Revan doesn't. He looks at Occlus levelly, and he relaxes his own control.
That... is not the aura of some random Jedi off of the street that decided to pretend to be a Sith Lord for giggles. That is not the aura of a Sith Lord that flinched and went to go become a Jedi because they flinched and felt bad. It's not really clear what he is, but he's strong enough to have a seat on the Dark Council, if he wanted it.
"Hi," he says, unintimidated.
"I could almost believe your name is true, were Revan not dead these three hundred years."
"Thank you. Your now deceased Emperor kept me in a torture box for a while. After he died I got let out."
"No kidding. But on the bright side, I can correct so many history records!"
"Yes. But that was not the purpose of this meeting. Malgus the Betrayer is both your enemy and mine. If he is allowed to expand his stealth armada beyond this planet, he will pose a serious threat to the galaxy. We must crush him, here and now."
"The stealth armada is definitely a problem," agrees Revan, evenly. "But while I'm flattered, I'm not actually commanding any major forces, sorry." He looks at the Republic commander. "Thoughts?"
"Not mine. My only role here is to end Malgus as efficiently as possible. Given the number of defections, both Imperial and Republic, a cessation of hostilities would be in our mutual interest."
"Really," says Callida, retrieving her datapad and looking at some figures. "So Malgus's assistance from the 451st company, the 94th engineering division, and your 822 and 921st airborne divisions, along with help from esteemed commanders Major Kando, Colonel Ardmore, and Captain Chi'thiac were... what?" She blinks and smiles politely. "Sanctioned republic assistance for the new Empire? I didn't know you were so supportive. Your men even switched uniforms. Was there a sale on fabric?"
"This is a temporary, localized ceasefire, I have no concern for the larger war, so long as we are able to contain Malgus."