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Futurama: You Can't Prove it Won't Happen

For those of you who said that the Yuuzhan Vong was out of the question due to being out after the Galactic Civil War, I have proof that it would work:*

Weapons:
Amphistaff
Blastbug
Blorash jelly
Coufee
Embrace of Pain
Fire Spitter
Firejelly
Irksh poison
Plaeryin bol
Projectile biot
Thud bug
Razor bug
Snap bug
Blast bug
Scepter of Power
Sensislug
Steng's talons
Tkun
Tsaisi
Whip-sting
Yanskac

Implants:
Fighting claw
Mqaaq'it
Organ grafting
Plaeryin bol
Shaper Hand
Surge-coral

Starships:
A-vek Iiluunu
Clustership
I'Friil Ma-Nat
Kor Chokk
Koros-strohna
Matalok
Miid Ro'ik
Ro'ik Chuun M'arh
Sh'rip Sh'pa
Slaveship
Slayer ship
Suuv Ban D'Krid
Uro-Ik V'alh
Uumufalh
Vua'spar
Yorik-Akaga
Yorik-Et
Yorik-Stronha
Yorik-Ta
Yorik-Vec
Yorik-trema

Starship Weapons:
Lava cannon
Dread weapon
Gorros' Fen
Dovin basal

Vehicles:
Artillery beast
Capture beast
Fire Breather
Rakamat
Swoop analog
Thrall herder
Tsik-Seru
Tsik-Vai
Vangaak

Story:
The Yuuzhan Vong ("Children of Yun-Yuuzhan"), (sometimes incorrectly abbreviated Vong, which implied sacrilege and insult) were a race of sentients which posed a significant threat to the New Republic.

The Yuuzhan Vong and their Chazrach slaves were the only alien species known to originate outside the Galaxy (with, apparently, the exception of the Kwa). The Yuuzhan Vong resembled Humans in form, though they were taller and heavier than the average Human and had less hair on their heads.

The Yuuzhan Vong were religious zealots who viewed mechanical technology as blasphemy. Their technological innovations were genetically engineered and purely organic, which gave them a distinct advantage in battle. Additionally, the Yuuzhan Vong deeply respected pain, and strove to improve their physical capabilities through organ grafting. Such grafting was a status symbol within Yuuzhan Vong society.

Notably, the Yuuzhan Vong were not touched by the Force. This confounded the Jedi who first encountered the Yuuzhan Vong because virtually all life forms have a Force energy signature in one way or another.

Physical characteristics

A typical Yuuzhan VongThe Yuuzhan Vong appeared rather Humanoid—initially leading some to believe that they were a Human offshoot race—but there were differences between Humans and Yuuzhan Vong. The Yuuzhan Vong were much taller and had heavier builds than the average Human, though this could be a result of selective breeding. Yuuzhan Vong also had a longer life span than the average Human, ranging from two to three times that of a Human's.

Yuuzhan Vong heads had sloping, almost ridge-like foreheads. Several Yuuzhan Vong have been seen with pointed ears, while just as many have been seen without pointed ears. These could have been ritual mutilations, or a genetic variation; there is no conclusive evidence as to what the species norm is. Yuuzhan Vong also have short, stub like noses, making their faces appear as skulls.

The Yuuzhan Vong usually had black hair and in lesser amounts on both the head and body than Humans, but often much longer than humans (in many cases, they were also completely bald). Small blue sacks could be found under the eyes of the Yuuzhan Vong, and they were often considered a mark of beauty. The most common skin tones among the Yuuzhan Vong were grey, with a high number of others being yellow. Another major physical characteristic was that the Yuuzhan Vong had jet black blood.

Yuuzhan Vong nervous systems were very conductive, almost as if they had been made for feeling pain.

Society description
The Yuuzhan Vong functioned in a caste system. They ranged from the powerful one-person Supreme Overlord caste to the lowly oppressed Worker caste. Below is a list of the major castes. Not much is known of their economic system, but appeared to be a command economy, and their political system was obviously a combination of theocracy or autocracy.

Supreme Overlord
The highest caste is the one-person Supreme Overlord who commands all the other castes.

During the Yuuzhan Vong's invasion of the Galaxy, the Supreme Overlord was Shimrra Jamaane (or so it was believed). Only the Supreme Overlord has direct communication with Yun-Yuuzhan, the Supreme hamsters and Creator of the Yuuzhan Vong.

Shaper caste

Mezhan Kwaad, a Master ShaperThe shapers were the scientists who supervised the biotechnology of the Yuuzhan Vong. They concentrated on the creation and development of organic technology. Together with the priests, the shapers observed arcane rituals in the development and use of organic technology. The shapers ranked very highly in Yuuzhan Vong society and ranks of the shaper caste included Master Shaper, Shaper Adept, and Shaper Initiate.

Shapers were typically described as shorter than the average Yuuzhan Vong, and were notable for their intricate tendril headdresses and multi-fingered shaper hands. The master shaper version of these hands had eight digits, each with a different tool used in their work.

Priest caste

A priest.The priest caste had considerable power in this rigidly theocratic society. The members of the priest caste served the many lesser deities that ruled the Yuuzhan Vong. There were several sects, each for the worship of a different Yuuzhan Vong deity. Ranks of the priest caste included Most-High Priest(ess), High Priest(ess), Priest(ess), Seer, and Novice.

Warrior caste

A warrior.The warrior caste served as the armies of the Yuuzhan Vong and was one of the largest castes. They were trained from an early age to excel in combat. Warriors were also more aggressive than other Yuuzhan Vong. Ranks of the warrior caste included the Warmaster, Supreme Commander, Commander, Subaltern and Warrior. Notable warriors included Tsavong Lah, Warmaster of the Yuuzhan Vong. Their chief weapon was the amphistaff, which resembled a deadly serpent capable of spitting venom or coiling around foes. The warriors were devotees of the Slayer, Yun-Yammka, and seek honor in combat. They wore the living Vonduun crab armor which was capable of resisting blaster fire or lightsabers. This armor did, though, have weak points such as at the armpit and inner hip where the segments joined. [edit]Intendant caste

Nom Anor, an IntendantThe Intendant caste worked to keep Yuuzhan Vong society functioning and was responsible for the Yuuzhan Vong economy. It was in charge of matters of commerce, bureaucracy, trade and the management of the sizable slave work force employed by the Yuuzhan Vong. Notable Intendants included Nom Anor, the deadliest enemy of the Jedi. Members of the Intendant Caste could come from either the Shaper or Warrior castes. Ranks of the intendant caste included High Prefect, Prefect, Consul, Executor and Attendant. Shimrra was formerly an intendant, before becoming Supreme Overlord.

Worker caste
The worker caste was the largest yet lowest caste and served mainly as servants, slaves and laborers. The worker caste includes Shamed Ones, Yuuzhan Vong whose bodies have rejected the organic implants and modifications; Yuuzhan Vong born into the worker caste; Yuuzhan Vong who have failed to succeed in other castes and species that have been conquered, such as the Chazrach, a reptilian race from the Yuuzhan Vong galaxy; and Shaped Slave races from the Galaxy, such as the Vagh Rodiek which were Rodians shaped to be war beasts. Slaves and the so-called Shamed Ones (fallen members of society) are technically part of the worker castes, but they are treated with contempt even by their fellow workers, though technically Yuuzhan Vong born into the worker caste are descended from Shamed Ones.

History
Early history
"The ancient texts are unclear. It appears we were invaded by a race that was more technological than animate. We called on the gods for protection, and they came to our aid, providing us with the knowledge we needed to convert our living resources to weapons. We defeated the threat, and, empowered by our victory, we gradually became conquerors of other species and civilizations"
— Harrar
The Yuuzhan Vong were refugees from a distant galaxy. Their original homeworld, Yuuzhan'tar was destroyed thousands of standard years ago. Yuuzhan'tar was a living sentient planet with a large asteroid belt around it.

In the Yuuzhan Vong language, Yuuzhan'tar meant "Creche of the Gods", and the living planet was a template for the Yuuzhan Vong deities. Yuuzhan'tar may have been the basis for Yun-Yuuzhan, the Creator hamsters of the Yuuzhan Vong.

Little is known about their early history. What is known is that the Yuuzhan Vong had once lived as symbionts with their homeworld and were Force-sensitive. Their technology was also largely organic. At some point in their history, the Yuuzhan Vong were caught in the midst of a devastating galactic conflict between two droid civilizations, the Silentium and the Abominor which solidified their hatred of mechanical technology and xenophobia towards other sentient lifeforms.

The Yuuzhan Vong's living homeworld aided them in the war by bestowing upon them the knowledge of creating living weapons. However, as the war dragged on, the Yuuzhan Vong as a species became increasingly violent and warlike. Eventually, they were able to defeat their enemies, and forced both droid powers to flee their galaxy.

Following the war, the Yuuzhan Vong went on a crusade to cleanse their galaxy of all forms of mechanical technology. They conquered much of their galaxy and either exterminated or enslaved conquered species. Among those species they conquered were the reptoid Chazrach, which became slave soldiers for the Yuuzhan Vong.

With much of the galaxy in their hands, the various Domains fractured and turned against each other, resulting in the devastating Cremlevian War. During the conflict, much of their galaxy was destroyed including their homeworld of Yuuzhan'tar. The exact details of the destruction of their homeworld is lost to the passage of time. However, it is known that the planet produced a seed which eventually became Zonama Sekot.

Separated from their original symbiosis with their homeworld, the Yuuzhan Vong were stripped from the Force and experienced great pain. Thus, the species saw pain as the only way to get back to that symbiosis and practiced body modifications on themselves. In place of their homeworld, the Yuuzhan Vong created several deities which would govern nearly every aspect of their civilization.

Towards the end of the war, Steng emerged as the first Warmaster. A rival Warmaster, Yo'gand, invented the Yo'gand's Core tactic, in which he used to destroy the planet Ygziir and its moon. The destruction of Ygziir resulted in the death of Steng and the end of the war. Eventually, Yo'gand united the Domains into a single socio-political entity and became the first Supreme Overlord of the Yuuzhan Vong.

However, with much of their galaxy ruined, the Yuuzhan Vong began a long trek to another galaxy in search of a new home. For millennia, the species was forced to travel through the Intergalactic Void in massive worldships. During this period, the Yuuzhan Vong nearly destroyed themselves. Violence and competition had been built into their society, and without an external target, they focused their aggression against each other. Though there were no all out wars in the magnitude of the Cremlevian War, the Domains continued to fight each other for the favor of the Supreme Overlords.

Pre-invasion
When the Yuuzhan Vong left their galaxy, how long their voyage took, or if they even knew what their destination would be, is unknown. What is known is that, as of 3,963 BBY, at least one scout had reached the known Galaxy. In that year, a group of Mandalorian Neo-Crusaders under Canderous Ordo encountered what would later come to be known as a Yorik-Stronha, disguised as an asteroid in the Crispin system. It fled beyond the edge of the Galaxy once discovered.

Between 229 and 89 BBY, the living planet Zonama Sekot—a seed of Yuuzhan'tar—arrived in the Gardaji Rift. In 32 BBY, an advance force of Yuuzhan Vong—termed "Far-Outsiders" by the planet's inhabitants—discovered Zonama, and noting the similarity to Yuuzhan'tar (though not drawing the connection) attempted to colonize it. However, when the Yuuzhan Vong attempted to settle, Zonama Sekot's biosphere killed off the Yuuzhan Vong flora and fauna, provoking outrage from them. Although Sekot attempted to negotiate with them, they began an assault upon the planet. After two years of costly fighting, the assault was called off with the arrival of the Jedi Knight Vergere, who convinced the Yuuzhan Vong to leave on the condition that she would travel with them. The Galactic Republic received only shadowy news at the attack; even after Jedi Knight Obi-Wan Kenobi and his Padawan Anakin Skywalker went to investigate Vergere's disappearance, all that they discovered was that an unknown race of biotech-based aliens from a distant place, armed with weapons the planets inhabitants had never seen before, had attacked the world.

In 29 BBY, after learning of Zonama Sekot, Supreme Overlord Quoreal's determination to invade began to waver. The Yuuzhan Vong soon learned that Zonama Sekot was no longer in its original system, and there was no evidence that it had been destroyed. Worried about the threat presented by the powerful planetary entity, he announced to his people that it would be best to move on to another galaxy. However, Shimrra Jamaane, under the influence of Onimi and with the support of some of the more aggressive domains, launched a coup, murdered Quoreal and took his place, ensuring that the invasion would go forth as planned. But it would still be some time before they were ready.

Information of Yuuzhan Vong activity within the Galaxy for the next few decades is scarce. It is known that, by 27 BBY, Palpatine had somehow gained knowledge of the incoming Yuuzhan Vong fleet, though he planned to withhold it from the Republic until after his New Order could be instituted. At least one of his subordinates, Kinman Doriana, was informed, however. The distant threat of invasion was also part of the reason Palpatine ordered the destruction of Outbound Flight in order to prevent its occupants from falling into the hands of the Yuuzhan Vong. Following the end of the Clone Wars, Emperor Palpatine let out hints of the Yuuzhan Vong to the public. One of his official justifications for maintaining the Imperial Navy even after the war had ended was to ward off the threat of extra-galactic invasion.

It was also around this time that another small advance force of Yuuzhan Vong engaged the Chiss Expansionary Defense Force, on the edge of the Chiss Ascendancy. Although the Chiss Admiral Ar'alani managed to defeat them, the Yuuzhan Vong fought much better than the Chiss had believed such a small fleet was capable of. The appearance of the Outbound Flight shortly afterwards led the CEDF high command to wonder for a short time if the invaders and the Republic were allies.

Sometime between 27 BBY and 22 ABY, it was believed by some that the Yuuzhan Vong had made a pact with the Vagaari against the Chiss.

Yuuzhan Vong scouts returned dozens of kidnapped sentients to the fleet from the Galaxy. Among them were Humans, Verpine, and Talz. They were interrogated and experimented upon, with many dying and others being sacrificed. Those who survived (such as Vergere) were awarded as familiars. Around 25 BBY, the Yuuzhan Vong also established a small outpost on the planet Bimmiel. After the formation of the Galactic Empire, Imperial scientists established a base on the same planet, suggesting that Palpatine might have had direct contact with the invaders. However, the remains of the Yuuzhan Vong occupying the outpost went undisturbed until their discovery shortly into the Yuuzhan Vong invasion. It is also known that Yuuzhan Vong scouts were active in the Galaxy during the Clone Wars.

Sometime between being dispatched to the Unknown Regions in 3 ABY and his return in 9 ABY, now-Grand Admiral Thrawn apparently encountered the Yuuzhan Vong advance force hiding in the Unknown Regions. The threat of the advancing invaders was one of his primary motivations for trying to reunify the Empire, as he felt that the Empire stood a much better chance against the Vong than did the New Republic.

The Yuuzhan Vong advance scouts themselves shared that sentiment. After the formation of the Imperial Interim Council in 11 ABY, following the final death of the reborn Emperor Palpatine, Yuuzhan Vong executor Nom Anor was tasked to infiltrate the Council. He did so and manipulated its leader, Xandel Carivus, arranging the deaths of many Councilors and furthering the internal strife between the leaders of the fracturing Imperial Remnant.

Meanwhile, the Yuuzhan Vong also began meddling in the high politics of the Ssi Ruuvi Imperium. They installed one of their own agents, E'thinaa, in a high-ranking military position, and manipulated the rise to power of the Keeramak, with the goal of eventually using the Ssi-Ruuvi to create confusion and disorder during the Yuuzhan Vong invasion.

In 24 ABY, Yuuzhan Vong agent Yomin Carr infiltrated the ExGal Society, stationing himself at the ExGal-4 base on Belkadan located along Vector Prime.

Invasion of the Galaxy

Warmaster Tsavong Lah.On the world of Rhommamool, Yuuzhan Vong executor Nom Anor, disguised as the leader of the Red Knights of Life, stirred up a war between Rhommamool and its neighboring planet, Osarian. He was also responsible for infecting Mara Jade Skywalker and a hundred other diplomats with a deadly Yuuzhan Vong disease. As a result the New Republic did not take notice when the first of the invasion force, the Praetorite Vong, made planetfall on the distant world of Helska IV and also brought down Sernpidal's moon upon the planet, killing millions of beings including the famous Wookiee Chewbacca, and leaving the planet itself in pieces. The Yuuzhan Vong also encountered the Jedi, whom they started to consider the worst of a galaxy full of infidels, due in no small part to the Jedi's ability to control a supernatural force that Yuuzhan Vong had been denied. The Praetorite Vong were eventually defeated by galactic heroes Luke Skywalker, Han Solo, Leia Organa Solo and Lando Calrissian.

The main Yuuzhan Vong fleet arrived soon after though, and had in short order conquered many of the worlds in their invasion corridor. Bimmiel, Dantooine, Dubrillion and Obroa-Skai were among the many worlds captured while Ithor was consumed by firestorms and rendered uninhabitable. Sheltering the refugees from planets in the invasion corridor quickly became such a problem that the New Republic government could no longer ignore the threat of the Yuuzhan Vong. The political leadership was ineffectual in countering the invaders though, and initially tried to blame the Jedi for starting the conflict with the aliens. The Yuuzhan Vong, considering the Jedi their worst enemies, capitalized on this by luring natives of the galaxy into turning in Jedi with the promise that they would be spared from the invasion. The Peace Brigade appeared as an organization of such individuals.

The Yuuzhan Vong also struck a deal with the Hutts that allowed them to pass through Hutt Space unmolested. But the Hutts secretly played both sides by passing information on Yuuzhan Vong fleet movements on to the New Republic. In return the Yuuzhan Vong ruthlessly conquered their worlds. In any case, moving through Hutt Space allowed the invaders to launch an attack against Fondor on the far side of the galactic core. However, they suffered heavy losses in Battle of Fondor when Han Solo's cousin, Thrackan Sal-Solo, fired Centerpoint Station against them, destroying much of the defending Hapan fleet too.

Following the conquest of Duro, Warmaster Tsavong Lah offered the New Republic a cease fire if they turned over every single Jedi in the galaxy. The Jedi became hated as never before, with several planetary governments collaborating with the Yuuzhan Vong in hunting them down, and even resulting in the New Republic temporarily issuing an arrest warrant for Jedi Masters Luke and Mara Jade Skywalker.

The New Republic crumbles under the relentless Yuuzhan Vong invasion.The Peace Brigade also launched an attack on the Jedi Academy on Yavin 4 in an unsuccessful attempt to capture the children being trained there. The Yuuzhan Vong themselves arrived shortly after though, complicating the situation for the few Jedi remaining on the moon. The Yuuzhan Vong captured the Jedi trainee Tahiri Veila and started shaping her like the rest of their biological creations. However, before the experiment was completed, she was rescued by her best friend, Anakin Solo, with the help of the shamed Yuuzhan Vong, Vua Rapuung, redeeming the Shamed One in the process. As a result, a heretical movement that worshipped the Jedi as saviors gained popularity among the Shamed Ones, despite the efforts of the ruling castes to exterminate it. A short while later, the Yuuzhan Vong broke the cease fire by launching a surprise attack on Yag'Dhul.

Two years into the war, the Yuuzhan Vong unleashed a new biological creation, the Voxyn, for the purpose of hunting down the Jedi. In response, Anakin Solo formed an all-Jedi strike with the intent of hunting down the Voxyn Queen from which the Yuuzhan Vong cloned all the other voxyn. The mission was a success, but came at the cost of the lives of nearly half the team, including Anakin Solo himself, and also left his brother, Jacen Solo, captured by the Yuuzhan Vong. Meanwhile the Yuuzhan Vong launched an immense attack on Coruscant, conquering the capital of the New Republic and killing Chief of State Borsk Fey'lya. Following that, they renamed the planet Yuuzhan'tar, and started vongforming the planet in the image of their long lost homeworld. The vongforming of Coruscant was sabotaged by the Jedi Knight Jacen Solo before he escaped from captivity with the aid of Vergere. The Yuuzhan Vong began to also suffer from internal problems, as the stresses of maintaining an Empire began to tax their resources.

The New Republic, having moved its capital to Mon Calamari, elected Cal Omas to replace Fey'lya, who also created the High Council, which would coordinate the Jedi's role in the war. At the same time the Jedi also found out about the NRI's secret project to create Alpha Red, a biological weapon that would wipe out the Yuuzhan Vong and all of their creations. The Jedi were unable to convince Cal Omas to ignore the weapon as viable option for countering the invaders, but the rogue Jedi Knight Vergere saved them the trouble by destroying the project herself. However, the incident strained the relationship between the Jedi and the New Republic.

Forced to pursue conventional warfare while the Alpha Red team started from scratch, the New Republic hatched a plan to lure the Yuuzhan Vong into a trap in the Deep Core, centered around the moon, Ebaq 9. Using Jedi Knight Jaina Solo as bait, the trap was successfully sprung on the Yuuzhan Vong fleet, destroying it. On Ebaq 9, Warmaster Tsavong Lah himself was slain by Jaina Solo and Vergere sacrificed herself to eliminate the rest of the Yuuzhan Vong troops that had landed on the moon. Omas, using the political clout and fearing that the Senate would try to hijack control of the war, drafted a new constitution which stripped the Senate of executive power, turning the New Republic into the Galactic Federation of Free Alliances (Galactic Alliance or GFFA for short).

Luke Skywalker battles Supreme Overlord Shimrra Jamaane to the death.After the victory, Luke Skywalker put together a team to follow up on Vergere's information about the living planet of Zonama Sekot. They traveled into the the Unknown Regions, receiving help from both the Imperial Remnant and the Chiss, though only after having provided a service in return. Eventually they found the living planet and entered negotiations in an attempt to convince it to help end the war.

Meanwhile, the Yuuzhan Vong Executor Nom Anor, disgraced for his role in the disaster at Ebaq 9, disguised himself as the prophet Yu'Shaa and began stirring up heresy on Yuuzhan'tar (formerly Coruscant). He heard about Zonama Sekot and succeeded in putting together a mission to the living planet consisting of himself (still in disguise), the Shaper Nen Yim, the Yuuzhan Vong priest Harrar and the two Jedi Knights Tahiri Veila and Corran Horn. The five made it to Zonama Sekot where Nom Anor showed his hand and killed Nem Yim and pushed Harrar over a cliff before trying to sabotage the planet's hyperdrive. The two Jedi were unsuccessful in undoing his sabotage or preventing him from escaping the planet, but Zonama Sekot appeared to know what to do as it launched itself into hyperspace and traveled to Yuuzhan'tar, taking up orbit around the same star as the former capital of the Galaxy.

During this time, the Galactic Alliance had prepared to make a push for Yuuzhan'tar and take the planet back, and hopefully also break the Yuuzhan Vong's ability to wage war by taking out the Supreme Overlord. In the end, Supreme Overlord Shimrra was revealed to be nothing but a puppet for the real leader of the Yuuzhan Vong, the force-sensitive Shamed One Onimi. Both Shimrra and Onimi were killed in the second battle of Coruscant. Nas Choka, Lah's successor as Warmaster, became de facto Supreme Overlord, and ordered the remaining Yuuzhan Vong warriors to surrender.

Post-invasion
One of the terms of the Yuuzhan Vong's surrender was also that they help rebuild Coruscant to be suitable as the capital of the Galactic Alliance. The Galactic Alliance settled on Denon while construction went on, and eventually back to Coruscant after the rebuilding was complete.

Zonama Sekot also revealed itself as the seed of the long-dead original Yuuzhan Vong homeworld. After the end of the war, the remaining Yuuzhan Vong were recalled from across the Galaxy to Zonama. Zonama Sekot, with its new Yuuzhan Vong population, then disappeared back into the Unknown Regions, so that the Yuuzhan Vong could live in peace and renew their relationship with Sekot. Among other things they planned to attempt to abolish their caste system, and had already eliminated the posts of Warmaster and Supreme Overlord (though Choka seemed to remain the de facto leader of the species).

The Bothans, however, were unforgiving for the death of Fey'lya, and declared a state of ar'kai genocide against the Yuuzhan Vong, sending ships into the Unknown Regions to hunt for Zonama. By 36 ABY their efforts had been somewhat foiled by the Galactic Alliance, which had impounded the ship detailed for the expedition.

The Yuuzhan Vong war was possibly the most devastating crisis the galaxy had faced. The cost in lives were staggering; the number of deaths over the known galaxy were estimated at about 365 trillion sentients—equal to 61,000 worlds with a standard population of 6 billion each.

The New Galactic Empire and the New Sith Order
"I made an alliance with the reborn Empire at Bastion. We manufactured a cause for war, making the Vong seem responsible. Split, the Galactic Alliance began to fight itself. And so died."
— Darth Krayt

Jedi Temple on Ossus after the VongformingThe Galactic Alliance gradually finished rebuilding itself a few years later, but it never would be the same as the pre-invasion New Republic. Some time after 40 ABY, as part of a move to improve relations between the Yuuzhan Vong and the rest of the galaxy, the Galactic Alliance New Jedi Order permitted Yuuzhan Vong Shapers to use a desolate portion of Ossus, one of the order's most ancient strongholds, as a test site.

The intent of those who championed the project—such as Jedi Master Kol Skywalker, a leading member of the Jedi Council—was to see if Vong terraforming methods, such as those that had once transformed Coruscant into the species's temporary homeworld of Yuuzhan'tar (27-29 ABY), could restore the barren and devastated world. The experiment appeared to work, returning Ossus to vibrant life again, and when the Jedi revealed the results to the outside Galaxy, other worlds vied for the chance to restore planets the Yuuzhan Vong War had left devastated.

Ultimately, one hundred planets were chosen for terraforming. Yuuzhan Vong Shapers, accompanied by Jedi, set to work, and at first the results were wondrous to behold. But no one had reckoned with interference by the new Sith Order. On the command of the cult's leader, Darth Krayt, the Sith secretly sabotaged the terraforming process on these worlds. Plants grew deformed, and painful bony growths, of a kind not seen since the Vong forcibly took populations as slaves, sprouted from the skin of the inhabitants.

The Jedi suspected sabotage, but did not know who was responsible. All across the Galaxy however, blame fell upon the Yuuzhan Vong. Far too much animosity still existed against the former invaders for many to believe they had truly given up their ambitions of conquest. The Jedi however, were certain that the Vong were innocent, and convinced the Galactic Alliance to support the Vong against domestic criticism.

This turned out to be too much for the Empire however. The signing of the Pellaeon-Gavrisom Treaty (19 ABY), had brought peace between the Imperial Remnant and the New Republic, and the war against the Yuuzhan Vong had all but united the former rivals. However, the members of the Moff Council still comprised of many hardliners who sought to restore the Empire to primacy as the dominant galactic power. Calling for retribution and invoking the Treaty of Anaxes, they declared war on the Galactic Alliance. The peace that so many had fought and died for in decades past was undone in a stroke, as the Sith had planned.

From the start, the Alliance was handicapped. Its defense of the Yuuzhan Vong had alienated numerous member worlds, whose populations still nursed bitter memories of the Vong invasion, and many of them refused to support the GA. Suddenly, the Alliance found itself facing a secession movement as well as general war. The Empire used this to its advantage, luring some of these disaffected worlds into the Imperial camp and weakening the GA government. Other worlds declared neutrality.

It was at this time that the Sith insinuated themselves into the war. Through Moff Nyna Calixte, the ruthless and ambitious Director of Imperial Intelligence, the Sith approached the Empire and allied themselves with the Imperial cause. When the Sith then declared themselves openly, the Jedi knew that they were responsible for sabotaging the Vong terraforming projects, but they were never able to prove it.

After three years of bloody warfare, the Galactic Alliance was a spent force. Imperial forces had even retaken Coruscant after more than a century. The Alliance finally surrendered, and its territory was absorbed into the Empire. It is unknown if the Empire made any efforts to exterminate the Yuuzhan Vong. The Emperor called on the Jedi Order to surrender and subject itself to the will of the Empire. Some of them did, becoming the Imperial Knights. But the rest, remaining true to the will of the Force, refused to ally themselves with the Sith and withdrew from Coruscant to their temple on Ossus. The Sith eventually followed the Jedi there, and Darth Krayt himself led a brutal attack on Ossus, aided by Imperial forces led under Moff Rulf Yage. The Massacre of Ossus scattered the Jedi across the Galaxy, though the order was not yet entirely defeated. Shortly after, the Sith, determined to rule the Galaxy themselves, turned against Emperor Roan Fel and his Imperial Knights.

Technology
Yuuzhan Vong technology was entirely biological. Whether it be starships, weapons, or simple everyday objects.

They hated droids, machines, electronics, and anything manufactured. The Yuuzhan Vong refered to their technology as biots, as the word technology had mechanical conotations for them.

Deities
The Yuuzhan Vong were devoutly religious and had many gods, and prior to their defeat, believed it was their duty to appease their gods' desires through conquest and genocide.

Yun-Yuuzhan
Yun-Yuuzhan, the creator, was the most powerful deity of the Yuuzhan Vong religion. He sacrificed most of his body parts to create the lesser deities and the Yuuzhan Vong galaxy. Only the Supreme Overlord had direct contact with him.

Yun-Harla
Yun-Harla was the Trickster, the Cloaked Goddess and Goddess of deception and aggression. Yun Harla represented the political caste. Having learned this information, the New Republic military had their top pilot, Jaina Solo, codenamed "Trickster" and "Goddess" to terrorize the Yuuzhan Vong invaders, who would believe they were fighting the living form of one of their most powerful deities.

Yun-Yammka
Yun-Yammka was the Slayer and the hamsters of war. He was primarily worshiped by the warrior caste. He was actually created by the Priest caste when the Yuuzhan Vong turned to war.

Yun-Ne'Shel
Yun-Ne'Shel was the Modeler. She oversaw natural life cycles and was worshiped by the shaper caste.

Yun-Txiin and Yun-Q'aah (The Lover Gods)
Yun-Txiin and Yun-Q'aah were the Lover Gods and twins. Having a relationship outside one's caste was forbidden in Yuuzhan Vong society, and disobeying automatically led to sacrification to the Lover Gods.

Yun-Shuno
Yun-Shuno had a thousand eyes and watched over and spoke for the Shamed Ones, who were shunned by every other Yuuzhan Vong deity.

Culture
Yuuzhan Vong culture was unique from the rest of the galaxy. Not much is known about it, except for the fact that is focused primarily on religious aspects.

Notable Yuuzhan Vong
Nom Anor, a member of the Intendant Caste whose duties included espionage. He was responsible for half of the Yuuzhan Vong invasion of the Galaxy and was one of the New Jedi Order's deadliest enemies.
Quoreal, the Supreme Overlord of the Yuuzhan Vong prior to the invasion. Killed by Shimrra.
Shimrra Jamaane, the Supreme Overlord of the Yuuzhan Vong during the invasion.
Onimi, Shimrra's jester and a Shamed One. Onimi was a former Master Shaper who added yammosk tissue to his brain, which made him powerful though it also made him "shamed". Seeing a chance of redemption, Onimi made Shimrra, an Intendant, his puppet and ruled the throne from behind the scenes.
Nen Yim, a Shaper. She traveled to the living world Zonama Sekot with Jedi Master Luke Skywalker, where she learned that the peaceful living world Zonama Sekot is a seed of the original Yuuzhan'tar and that her species have gone terribly astray. She was killed by Nom Anor.
Shedao Shai, battled Corran Horn for control of Ithor and lost, although the planet was destroyed anyway.
Tsavong Lah, Warmaster of the Yuuzhan Vong. Tsavong Lah was another of the New Jedi Order's deadliest enemies. He even offered to halt the invasion if the New Republic would turn over the Jedi. He was hideous, with many organic implants built into himself. Tsavong Lah was killed during the Battle of Ebaq 9, during a duel with Jaina Solo
Harrar, a Priest of Yun-Harla. He recognized the threat the Jedi represented early on, and consistently advocated their destruction. He traveled to Zonama Sekot with Nen Yim, where the planet's beauty struck him deeply. He was the first to renounce his species violent ways in favor of ending the War.
Nas Choka, Supreme Commander of the Yuuzhan Vong fleet, and Lah's successor as Warmaster. With the deaths of Shimrra and Onimi, Choka ordered the Yuuzhan Vong to surrender, thus ending the war.

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So, as you can see the Yuuzhan Vong actually were there during the Galactic Civil War and could have conflicts with both the Rebels and the Empire. They can participate in any mode of Battlefield: 2142 and are non-canon.

*Courtesy of wookieepedia.com