Darth Grievous' Sith Legion

Darth Grievous's Sith Legion (Also called Darth Grievous's Sith Empire or the Sith Legion) was the evil tyrannical government and revived version of the CIS that token over the Galaxy 10000 years after the clone wars.

They sucked planets dry of their energy and resources, they enslave people, they murdered millions and had ruled with an iron fist. The only ones opposing the Sith Legion were the heroic Autobot Jets, the Jedi and the Autobots. The Sith Legion won many battles in the Transformers Wars but was dissolved and disbanded when Darth Grievous was killed by the Matrix of Leadership.

The Rise of the Legion
This legion was founded by Darth Grievous after Darth Grievous's rebirth. This army had nothing but robots in the organization and this legion wants to enslave the humans and the cybertronians and will kill those who stand in their way. Darth Grievous welcomed Starscream and the Seeker jets into their ranks. Anyone who refuses to join the legion were either scrapped or killed. Many planets had fallen to the Legion and those star systems had their resources sucked dry and millions were killed or enslaved.

The Transformers Wars
The Transformers Wars started when the Autobots and Cybertron were summoned into the Star Wars Universe so the Autobots can help the Jedi. The Sith Legion had conquered many planets and star systems and sucking the captured systems dry of energy. Darth Grievous made a clone of Optimus Prime named Nemesis Prime who lead the Sith Legion into conquering many systems but the Prime clone was killed by the real Optimus Prime. The Legion won many battles at Hypori, Geonosis, Tatooine, Dantooine, Naboo, and even Mustafar. The Autobots and Jedi however retaken those planets they conquered and built Autobot Cities at those locations to fuel the Autobots war machine. The Sith Legion killed many Autobots and Jedi on Ilum and had many heros like Dirge, Ramjet, Thrust, Devastator, Predaking, Menasor, Terrorcons, Bruticus and even Acid Storm.

Downfall
In the last episode the Fleets of Autobot Venator Star Destroyers and the Sith Battleships battled aboved Korriban and the Sith Legion made their last stand on Korriban. The Autobot Cars were transported by Acclamator Crusiers for the ground assault on Darth Grievous's Sith Fortress. During a battle with the sith legions leader Optimus Prime open the matrix to lightened the Star Wars and Transformers universe's darkest hour and destroyed the Sith. The Seekers were forced into hidding after the Autobots victory and the Sith Legions defeat. But underneath the ruins of Darth Grievous's fortress a cape wearing ghost of Grievous said "We shall rise again!".

Government and Politics
This government has the same Politics as the Separatists only it has various elite guard units like the Seekers. Also most of the leaders, elite warriors and Generals wore capes to intimidate their enemies.

Military
The military forces of the Dark Legion—also known as the Dark Army or the Sith Army—was a massive mix of weapons of war, battle droids, Caped Magnaguards, Kaleesh Warlords, Combaticons, Stunticons, Constructicons, Terrorcons, Predacons, Seeker planes, organic forces, Sith lords, Sith Sorcerers, and local warriors. The Sith Legion had many warships including the Malevolence II, the Corsair II and the Invisible Hand II.

Economy
The Sith Empire was far bigger than the Autobots, but much wealthier and more centralized, and in possession of unique and potent technologies. The Sith Lords allegedly controlled the riches of a thousand species.

During the time of the Transformers Wars, the Legions population was far more than that of the Autobots.