Foreword
248 years passed since the Battle of Yavin, and 110 since the set up of the Galactic Federation Triumvirate. Although the New Jedi Order defeated the One Sith, after the dark lord, Darth Krayts fall everyone thought that Sith were gone, but they hid in the shadows of the universe, and slowly rebuilt their forces.
When they were strong enough to fight, they attacked planets, and invaded them. Although the Federation raised against them, there were places where they got footholds. Places like Klatooine and other Hutt planets, or other places what's outside the remit of the federation. They even managed to build Sith Temples, and find ancient Sith Holocrons.
In conclusion, everything started to fall back into the state Of the Old Republic. Sith and Jedi fought merciless battles against each other, while the Galaxy started to be divided. Thanks to Master R'tah -the descendant of Master K'Kruhk- The federation supported the Jedi, but as a result of this, Rianna Fel the granddaughter of Marasiah Fel, and empress the Empire-in-exile announced that The Empire does not wish to be part of the triumvirate, and started to support the Sith and for exchange the sith lords helped her to increase her influence, although her grandmother fought against the them back then. This gave a final push to the Sith to regain forces.
The most critical situation was in Dantooine, where was both a Sith and a Jedi temple. This planet was Close to the Federation and the Empire too, and this was the only reason that the war didn't start for the planet yet. Both of the sides were prepared to being attacked, and the restlessness increased day by day. The Sith Lord, Darth Ralen and his apprentice, Darth Lyvana trained a smaller Sith army there, meanwhile in the Jedi Temple, Master Rinvea Skywalker, Master Zapoo Gal, Master Andan Starire, and Master Rakhall trained the new generation of the Jedi.