Initial information: The action of the prologue takes place in 1 ABY, and the plot itself implies that Shmi did not die on Tatooine a short time prior to the Clone Wars' outbreak.
The dark chamber was not either a spacious or a well-maintained place. In spite of walls being appearing here and there, the room was mostly composed of rocks, which, before ages, formed in such a wat as to co-exist with the trunk of the ancient immerse oak upon the moon of Endor.
In fact, it was a cafe, though not referred to in this way in many years, since one of the Sith lords arrived there prior to the proclamation of Darth Bane's doctrine. Ever since that point, it was rather a temple. Now, from among the overwhelming darkness, two figures could be spotted. One, with the head covered with a hood only, was undeniably female, and the other must have been a massive, robust man's, a heavy metal mask settled on whose face. Both of the persons were sitting opposite each other, and the closer to them one found oneself, the clearer it became that a crucial dispute to them both was being conducted.
"Shmi", said the man with his voice being modified due to the helmet. "The time has come for your eventual trial."
The woman did not respond, as though awaiting the man's sign.
"The time has come to reveal ourselves to the Sith and the handful of remaining Jedi", the masked carried on.
The female individual slightly raised her head, displaying a range of wrinkles and other marks pointing to her elder age.
"There aren't many of them after the eighteen-year purge", said Shmi.
The man did not comment on her words, but rather continued the speech of his.
"The time has come that our Xithan loyalist and we abandoned the hideout. It is time for the Sith to end."
"Right", the woman responded. "Over a thousand generations, the Sith have forfeited the power given to them, just like they're forfeiting it now, concentrating their force in two individuals."
The masked man inhaled, so that a white gas began running from behind his head. Shmi realized what her speaker was thinking.
"Do you think we'll be needing him", she asked.
"Yes", he said. "Your son's horizons are nowhere near those of his master, in the face of which a chance exists that he may realign himself with us due to the strong bond connecting you."
"He will join us or die, Master."
Summary: In 1 BBY, in the Endor Sith Temple, Shmi Skywalker and her mysterious master discuss the plan to reveal the Altersith Order to the Sith and a remaining handful of Jedi. The master intends to involve Shmi's son, Darth Vader, in the plan.