Great Trellosian Conquest

The Great Trellosian Conquest was one of the most notable events in galactic history, and resulted in the galaxy being shaped the way it is today, taking place around 10 BTC (Before Trellosian Conquest) and ending in 0 ATC (After Trellosian Conquest).
== Preface ==
The Galactic Imperium (also known as the Eternal Celestial Dominion or Xiolithian Empire) was a highly advanced primordial empire that ruled most of the galaxy with an iron first and enslaved millions of planets for over ten thousand years. Though the Imperium was defeated in the intergalactic civil war, it's downfall was gradual and began several years prior. This allowed the Trellosian State, a vassal under the Imperium, to prosper more than others due to it's remote location in the outer rim, and the Imperium's focus towards the galactic core. 
Whilst the Xiolithians were hated almost universally by most species within the galaxy, the Trellosians despised the Xiolithians the most. In the wake of centuries under Imperium dominion, the Trellosians, a proud and devoutly religious people, found themselves increasingly disillusioned and resentful. Whilst the Imperium was unable to completely enslave all Trellosians worlds due an order of dark sorcerers, known as the Cruxi, they vastly outnumbered them militarily and their technology was centuries ahead. 
Recent desecration of their sacred sites by the Xiolithians to expand their regime fueled anti-establishment sentiment among many of the Trellisians. When a crisis involving another vassal state momentarily diverted the attention of Imperium, the Trellosians seized the opportunity to covertly begin stockpiling weapons and engaged in the reverse engineering of enigmatic Xiolithian technology, an act of defiance against their oppressive overlords.
Amidst the brewing rebellion, fervent religious zealots emerged as prominent figures, passionately voicing their violently anti-establishment rhetoric. Gradually they gained influence and began to gain popularity and control of the pupped government installed by the Imperium. Concurrently Trellosian engineers made breakthroughs in their understanding of Xiolithian technology, whilst Trellosian sorcerers expanded their abilities through the study of their overlords' abilities and knowledge. Building upon their existing powers and knowledge, the Trellosian sorcerers harnessed the ancient wisdom and intricate techniques of the Xiolithians to greatly expand their own abilities. Over the course of several years, the Trellosians secretly prepared for open war against the Imperium.
== Uprising ==
=== The Xio-Plague ===
Amidst the growing sprawl of their empire, a mysterious disease emerged that began to plague the Xiolithians. Whether it was created or evolved by itself was never determined, however it exclusively infected Xiolithians, and thus became known as the Xio-plague. It been speculated by some scholars that it was engineered by Trellosian scientists and sorcerers after harnessing the power of their masters in secret. Because the disease could be carried by virtually any species but only harmed Xiolithians, slave species and vassal states began to voluntarily expose themselves with the disease. Whilst it was initially slow to infect it's Xiolith hosts, it's effects were catastrophic and the rate of infection exponentially worsened. At first the disease would weaken and disorient it's hosts. In later stages, it would cause many of it's hosts to gradually lose intelligence and thus ability to use their technology and supernatural abilities. About a third of Xiolithians infected with the Xio-plague would die directly from the disease within months. 
=== Rebellion ===
Fueled by rage, hatred, and religious fanaticism, the Trellosians took their golden opportunity to strike a critical blow at their overlords. Trellisian sorcerers emerged from Movolo and other hidden worlds, quickly defeating and expelling their masters. Emboldened by their desire for freedom and the plague (which was largely seen by religious Trellosians as a blessing from their ancestors), the Trellosians launched a series of hit-and-run operations against the Imperium to sabotage key targets. In the chaos that ensued other vassal states began to rise up against the Imperium, spurring a galaxy-wide rebellion. 
=== Mutation ===
In later stages of the rebellion, the Xio-plague mutated and began to cause many of it's survivors to degenerate into twisted, zombified monsters that crawled on all limbs and were largely incapable of critical thinking skills and speech. Whilst the Imperium was already collapsing at this point in time, this only accelerated it and caused the Xiolithan species to become largely non-existent within years of the war, eventually becoming widely forgotten about and thought extinct thousands of years later in 1432 ATC.
=== Collapse of the Imperium and Xiolithians ===
Amidst the Trellosian incursion and Xio-plague, various other vassal states expelled their masters. As the Imperium rapidly collapsed and the Xiolithians had no choice but to abandon their dominion and return to their home world Luminae, as their throne world Xio Prime had already been completely overran by mutant Xiolithians, now known as necrothauls. After returning to their homeworld, the remaining Xiolithians cut off all hyperspace access to the planet. It is unknown if the disease made its way to Luminae before they were able to isolate themselves. 
=== Aftermath ===
What was once the greatest empire the galaxy had ever scene, enslaving most of the galaxy's inhabitants for millennia, had turned completely to ashes in a very short span of time. 
Planets inhabited exclusively by Xiolithians were either abandoned, destroyed, or overrun with necrothauls. Most worlds became uninhabitable necrothaul wastelands, known as tomb worlds, and largely forgotten about. Others became relic worlds, many of which have fallen off recent star maps, waiting to be rediscovered by explorers. 
== Conquest ==
Following the rapid collapse of the Imperium, the galaxy was now free after over ten thousand years of enslavement. In the power vacuum that followed, many nations began rapidly expanding, and the galaxy soon found itself in a multilateral war between dozens of nations and micronations. Whilst the Trellosians's campaign to liberate themselves had succeeded, after centuries of oppression, freedom was not enough for many religious zealots. Driven by an unwavering belief in their own superiority and distorted interpretation of their faith, a group of extremists and sorcerers known as the Crux Mandate began to take control of the Trellosian government, seeking to expand their influence across the galaxy. This marked the beginning of a grandoise campaign known as the Great Trellosian Conquest. 
Viewing the galaxy as their rightful domain destined to be ruled by Trellosia, the Crux masterfully maneuvered their way into positions of power within the central Trellosian government. They wielded their influence to install a popular and charismatic extremist leader, known as Lux, as the nation's "Supreme Marshal", executing all other prominent government leaders in the process. 
With powerful sorcerers, and reverse engineered Xiolithian technology at their disposal, the new Trellosian Empire had a significant advantage over all other factions. The Trellosian Empire began quickly assimilating nearby planets, colonies, and empires, easily crushing most opposition. 
== Effects ==
The effects the Trellosian Empire caused upon the galaxy were tremendous, even causing the total annihilation of some cultures and nations. Despite the thousands of years of tyrrany from the Imperium, things had remained relatively stable during the latter of that time period outside of occasional insurrection and wars. 
== Downfall ==
Despite the immense willpower war machine the Trellosians had, their rapid expansion left them unprepared for the sprawl they would face, and for the infighting among Crux warlords, slowing their expansion after several months. The Federation, with a considerably smaller navy than the Trellosian Empire, was losing ground, and Trellosians would soon overtake Kronos. As building new ships would take more time and resources than the Federation could afford, in an act of desperation, the Federation began retrofitting a class of large and well armored cargo ships with advanced shielding and weapons. Despite unfavorable circumstances, the Federation managed to prevail and drive off the Trellosians from the planet. 
After facing such a loss, morale in the Empire began to wane, causing infighting to peak. Several prominent warlords began to relentlessly fight each other and cutting of supply routes. Lux's campaign, after lasting several years, was beginning to collapse in on itself. While the Crux had masterfully orchestrated the largest and fastest conquest the galaxy had ever seen, they had failed to account for the infighting it would cause, and the resources it would require to sustain. Facing collapse, one warlord orchestrated the assassination of Lux, hoping it would end the relentless expansion and allow them to settle. Unfortunately, the Empire was a house of cards and the death of Lux resulted in nothing less than total anarchy. The Empire strongest warlords battled each other fiercely for control of the Empire, and Trellosia's eyes turned inward towards itself.
With the bulk of the Empire being dismantled by it's own infighting, other factions were free to build up their armadas and strike back. Slowly over the course of several years, the Empire fractured into dozens of weak microstates, and the rest of it was pushed back to the Cruxi home system of Vor Kortis. 
Though what was left of the once great Empire was now technically harmless, the Federation viewed it as a threat that if left unchecked could return, and possibly succeed in establishing another millennia long dominion, something which they could not let happen again. The Federation returned to Vor Kortis, brutally wiping out the remainders of the Trellosian Empire.
== Aftermath ==
Few survived the Vor Kortis extermination order, and those who did eventually died out. To the knowledge of the Federation, the Cruxi were defeated once and for all. Despite this, a group of several thousand managed to escape the holocaust, and fled deep into the outer reaches of space.
This group, known as the Crux Remnant, wandered in space for decades, until rediscovering Movolo. The world, covered in dense swamps, jungle, and mountains, was permanently stormy due to experiments performed by Cruxi decades ago, and as such had been abandoned, but was filled with ruins and relics of a long bygone era. Over the course of a thousand years, they would rebuild, secretly forming the Crux Empire in the distant reaches of space, one day to return and wreak havoc upon the galaxy...