Omni Legion

"It doesn't matter where we come from, all that matters is we’re here and we serve our Emperor."

- Attributed to an unknown Omni Legion Battle-Brother

A loyalist Chapter of unknown origin. Working primarily in the Segmentum Ultima the Omni Legion ally themselves closely with the Adeptus Mechanicus, the Salamanders, the Dark Angels, the Ultramarines and the Order of the Sacred Flame. Despite their undying loyalty to the Imperium and its people the Chapter's history has made the Inquisition suspicious of their very existence. Kept at bay thanks to the influence of the High Lords of Terra and being watched closely by the allied Adepta Sororitas Order, the Inquisition still requests frequent examinations of the Chapter which is handled by the Magos Biologis themselves, with reports from them and the Chapter itself. Best described as an armed cleanup crew for the Adeptus Mechanicus, they search countless systems for traces of technology lost over the millennia.

Founding
In the year 422.M34 a small Explorator Fleet from the Forge World of "Roithea” was dispatched during one of the Forge World’s expeditions to find a potential STC. This specific mission took them to a world in the northern sectors of the Segmentum Ultima one which had oceans of pure ice and vast forests of razor sharp vines also covered in ice. This Death World was dubbed, “Vintis”. The fleet’s attention was drawn to it because of a faint signal, coming from one of the few locations that wasn’t shrouded in these masses of vines. It was difficult to determine what the signal was meant for as it didn’t appear to be a distress signal.

The Explorator “Myrddin” landed on the planet’s surface and upon exiting his ship with a small force of Skitarii they were quickly overwhelmed by subzero temperatures that frosted their metal limbs. It didn’t take long to find a large metal door intended to welcome those as large as 10 feet. It took mere hours for Myrddin to console with the door’s machine spirit, through this exchange he knew something was very wrong with this world.

Many of the details of what happened inside is undocumented in official files, if there’s any it’s possible they’re available to the Adeptus Mechanicus and High Lords of Terra. What is known is that inside this fortress were Astartes. In close to 200 pods they slept. Countless technology from the great heresy itself, suits of Cataphractii Terminator armour and unused Contemptor Dreadnoughts. Even a perfectly intact Gene Seed was found in mass. One more item found inside was the one thing Explorators such as Myrddin can only pray to see once in their lifetime, an STC.

Upon returning to Roithea a small number of the Astartes were released from their pods with the Skitarii surrounding them as they stood before “Evienne”, the Fabricator-General who looked down at the confused Marines. Days of questioning proceeded as the High Lords of Terra were informed of this discovery. Through the questioning it was determined these Astartes had no memories of their conception or even their identities.

During this time secondary fleets were sent back to Vintis to search other locations with the intention of finding similar heresy era technology or perhaps something older than that. Last contact was months. Due to the proximity the system had to Baal the Blood Angels Chapter sent both the 3rd and 4th Companies to investigate by orders of the High Lords of Terra. The reports that returned were disturbing. The fleet’s remains were hardly husks as the ships were torn apart and gutted. Blown to pieces and everything that wasn’t the framework was gone. That wasn’t the strangest part. Vintis was also gone. Vanished. The only explanation was a warpstorm dragged it away from the materium.

By the time the 7th Founding came it would also be determined that the Forge World of Roithea would serve as the Chapter’s supplier for weapons and vehicles. Production for the world boomed and received additional resources from nearby systems to aid in the production of things ranging from a bolt pistol to mighty Battle Barges. The High Lords of Terra made the decision to have this new Chapter dubbed “The Omni Legion” operate in the Segmentum Ultima. Their primary duty was to pursue technology in the same way as the Explorators as a result of the major loss of many Explorator ships. By the year 503.M34 another Formation was created with the intention of seeking a world to call home for the Chapter and construct their Fortress Monastery.

Tallon V
Hosted the Chapter and their Fortress-Monastery from the year 913.M34 to 398.M37 In the year 907.M34 the Death World of Tallon V was discovered by the Omni Legion's 5th Formation led by Paladin Galehaut during a scouting mission. The planet is roughly 5540 km in its radii, putting it roughly 15% smaller than Holy Terra. The purpose of this was to find a world that would best suit training the Chapter’s Initiates and Tallon V was found. The temperature of the world could reach heights that would kill any normal human. The only protection from the rays outside of man made structures are caves or the thick clouds of sand that can block out the sun for days. The planet itself has a slower rotation, mixed with its orbit around the sun the majority of the planet to always face the Sun. There were thousands of human settlements that existed along the borders of the sunrise and sunset, named “The Divide”.

Many of these early settlements were initially hostile toward the Astartes and as a result were wiped out by them in self defense. Eventually the Astartes were able to get in contact with leaders of several of these settlements who convinced the migrating groups that they were going to strike a deal with the Astartes. They warned the other groups to move far away weeks ahead in case things went wrong and the Astartes became hostile. In truth these leaders hoped they would become more powerful by serving the Astartes which they did very quickly, taking a knee to Paladin Galehaut they swore their loyalty to the Imperium.

Over the millennia the world was occupied by the Administratum as it began the construction of large cities that the planet’s former occupants moved away from. These cities were constructed on the dark side of the world to ensure the planet’s populace wouldn’t be in danger of the sun’s heat. The darker side of the world has it’s shared dangers as the wildlife outside the city has forced the construction of large walls with powerful lights to keep away many of the light sensitive creatures. Ranging from massive mammal creatures with a bone-like armour on their flesh that crave humans to small insects that will burrow into human flesh to seek warmth.

Life on The Ark
"The Ark", is a massive ship capable of housing the entire Chapter, their allies and their fleet of additional ships should the moment arise. The Adeptus Mechanicus holds a large presence on the ship as part of the agreement between The Omni Legion and Roithea, all technology recovered by the Chapter is to be overlooked by the Adeptus Mechanicus on board before it’s taken to Roithea to ensure it’s condition and any additional research performed before it’s turned over. In the time the Chapter has worked with the Adeptus Mechanicus of Roithea there has never been a situation where an STC or anything else of value has been hidden by the Chapter from the Mechanicus.

Typically The Ark will move from Roithea to Tallon V, should it’s support me needed at either world. There have been reports of The Ark aiding in the support of Imperial fleets within the system but no exact accounts can be given.

Companions are expected to work at any time of the day but each one is granted 1 day a year where they are free to do as they wish within their quarters for 24 hours.

Space Marines of the Omni Legion enjoy the sounds of music that can be heard throughout the Ark, systems set up throughout the walls to play melodies meant to help Marines and Companions focus on their tasks at hand or even to help them relax. Music also plays a large role in battle as the vehicles and armour of the Chapter are capable of projecting these tunes over large distances as a means to raise moral and intimidate their foes. It works to attract the attention of the enemy making for a great distraction so squads moving to flank can approach with ease. Unsurprisingly this approach at first brings fear to even Imperial forces because the thought of Noise Marines approaching comes to them.

Should the entire Chapter be dispatched to multiple campaigns they will leave the ship to their Companions with the Adeptus Mechanicus to watch over while protected by a small legion of Skitarii who’s weapons would reduce any intruders to vapor.

The Ark's Vault
Deep within the Ark is the Chapter’s personal storage of all relics, technology and other valuables. Appropriately named the Vault.

The creation of this place was thought of by the Chapter's Paladins as the Lord Curator complained for many years that the items the Chapter collected was growing too vast to contain within their original Fortress Monastery

The only members permitted to enter the vault are the Curators, Lord Curator (High Chaplain) and the Lord Paladin (Chapter Master) himself. Any other who attempts to enter would be stopped by the Vault's security protocol which seals the Reclusiam and alerts everyone on board the Ark.

Marines of the Chapter are only welcomed into the Vault by the Curator’s once they achieve the rank of Knight Sergeant, granted a weapon and helm from the very Vault itself.

As expected the Master Curator and Lord Paladin are the only ones who knows every single item that exists in the Vault, which stretches for several miles, there hasn't been any clear measurements. Curator's have the potential to never see the battlefield as their life would be spent cataloging and organizing what’s found in the vault. There are rumors that there are actually hundreds of live organisms inside the vault, a couple loose running around unable to escape. There is one instance where a Curator actually found a dead Cthellean Cudbear while he was taking a pre-heresy stave in to be stored.

Most relics of the Chapter are kept here while the Paladins of the Chapter guard relics unique to their Formations. It’s believed that many of these relics are taken from Renegade Chapters.

The remains of their Dreadnoughts are kept here should they be damaged beyond repair.

Chapter Organistion
The Chapter’s Serfs called "Companions" are treated well compared to the Serfs of Chapters like the Imperial Fists or Iron Hands. They aren't abused, looked down to or straight up ignored. The role of an Companion is to provide the Space Marines or their ships with whatever they need when they need it.

During their travels they'll often catch communications from fellow Astartes or other Imperial forces that require aid. The chapter may come to assist their allies should the call be there. The sheer size of The Ark makes it possible to house several thousand more hands should a planet wide evacuation need their help, keeping the people locked from Astartes or Companions should Genestealers or similar Xenos be blending with the populace. The closest Imperial world will then be the next location to drop off the masses before the Chapter moves on.

Sometimes a situation may arise when a Neophyte is split from his Chapter or his Chapter has deemed him unfit for duty, such as the Iron Hands. Rather than leaving the Neophyte to his fate the Chapter  would take them in under their ranks.

Unlike most Marine Chapters The Omni Legion have 5 Companies. This Chapter is divergent from the Codex Astartes. Having different Formations (Companies) fill different purposes for different scenarios. Ranging from a Formation meant for low-scale excavations and training of recruits or forces meants to clear out hostile native life, support allies or to lay waste to the Imperium’s foes by leaving their world a flaming ruin. Claiming to follow the Codex Astartes ordering that Space Marine Chapters are not meant to surpass 1000 Astartes but the Inquisition suspects this may be false. No evidence during inspections by the Inquisition with additional information provided by the AdMech has shown this to be the case. The Chapter’s ability to replenish their numbers quickly is what drives these suspensions.

The 1st and 2nd Formations are been known to track down and Renegade Chapters and execute them with extreme prejudice. The Venom Thorns Chapter is one such example after they sustained critical losses by the hands of a single Chaplain of the Imperial Fists. Should the technology of these Renegades remain untouched by the taint of a chaos it is taken by the Omni Legion. Most of it finds its way back to the Adeptus Mechanicus but sometimes their work is rewarded with permission to keep many weapons and armour they reclaim for the Imperium.

Ranks of the Chapter
The ranks of the Adeptus Astartes are different to typical Chapters in their names:

Initiates (Neophyte)
Space marines in training, making up the bulk of the 5th Formation they are sometimes spread to other Formations should more Initiates need to go through proper training. After several years of aiding the rest of the Chapter they’ll complete their training each member of the squad must recover something for the Mechanicus, only then will they deemed worthy explorers for the Imperium.

Knight (Battle Brother)
A Marine who passed his trials will join the rest of the Chapter. Equipped with the typical gear of an Astartes. The backbone of the Chapter these Marines range from Tactical Squads to the mighty Centurions.

Knight Sergeant (Sergeant)
Squad leaders of Legionnaires are granted this title because of their iron resolve and unbreakable bond with their battle brothers. Wielding a relic weapon from the vault on The Ark and donning the helm of a past brother from crusades long since past. Guiding his brothers through the forests, deserts, tundras and hell landscapes to find relics and technology left from ages long since passed. Destroying the enemies of mankind as they go.

Knight Commander (Lieutenant)
only in the recent 999.M41 has this rank been reintroduced with the rise of the Primaris Marines. Two of these Astartes operate directly under the Paladin of each Formation, working to relay their orders to the Legionnaires. All Knight Commanders are Primaris Marines as the Omni Legion Chapter believes that these new Marines will need to become integrated into their ranks should they be able to carry out the Imperium’s will at their fullest.

Paladin (Captain)
Space Marines who reach this rank are put in command of a Formation and are expected to get results as they are accompanied by a Chapter Curator who assists in organizing and guiding Formations during their campaigns. Each Paladin changes their name to fit their new title for whichever Formation they lead. Nothing such as numbers are given to these Paladins as a way to provide a form of pride and mystic to other Chapters. Only the Curators, Lord Paladin, AdMech of Roithea and High Lords of Terra have the knowledge of how many Paladins have led each Formation.

The Lord Paladin (Chapter Master): The leader of the entire Chapter is given this rank, this rank was only given this name after the Chapter was renamed The Omni Legion. The first Lord Paladin is rumoured to be not even the second or third Chapter Master. The first Lord Paladin was named “Artorias”. After this the new Lord Paladin adapting the old surname of the previous became tradition as it did with the Paladins.

Specialist Ranks
These are Astartes who have served the Emperor’s will for many decades to centuries or have been built to serve a specific purpose. Seen as the pride of the Chapter and always guiding their Astartes brothers through the battlefield or forging them and their doctrines through intense training. Ranging from simple Astartes who have seen thousands of battles and have spent their lives on the battlefield to Astartes who are powerful Psykers and can turn the tide of a battle with a simple thought.

Chroniclers (1st rank Librarian)
Keeping to The Ark’s inner sanctums where their role is to record the Chapter’s exploits. They spend days locked away writing miles of paperwork and working on creating the lists of bounty the Astarte’s return with on their travels. Trained by the Sorcerers of the Chapter their training is directed by the Master Sorcerer.

With the addition of Primaris Marines into the Chapter it's been decided that they will not join these ranks. This choice has been made because the concern that a more pure Geneseed could cause a loss of the Chapter’s psychic ability to track technology as accurately.

Sorcerer (2nd rank Librarian)
Trained to use the powers of the Warp these mentally trained soldiers can bend reality as though it were their plaything, lightning bolts from their fingers to bursts of flames from their eyes. Wielding Force Staves designed to help them channel their powers in powerful melee strikes they can lay ruin to foes should they enter the battlefield.

Appearing alongside their non-Psyker brothers on the battlefield as part of the Formation leadership they are able to guide them through any fog of war.

Lord Sorcerer (Head Librarian)
The title of this rank and the 2nd rank Librarians are told to be in memory of an old comrade of the Chapter back during their time in the Warp. Commanding everyone within the Librarium and pushing for further research of the Warp and their ways to harness its power.

Curators
he role of these Marines are the organization and documentation of the countless treasure and relics that are accumulated over the millenia. Outside of battle it is the duty of the Curator to lead morning prayers onboard the Formation’s Battle barge in the Reclusiam and clean all relics of the Chapter that is with them. Onboard The Ark they work days organizing and maintaining the Chapter’s relics or anything that is recovered by Formations and brought to be placed into the Vault.

Each Formation has one of these men as part of their leadership. Keeping moral high the Curator charges into battle to destroy the foes the Imperium deals with every moment of every day, inspiring his fellow Legionnaires with his words and demeanor.

Lord Curator (High Chaplain)
Not having any direct subordinate like most Chapter’s he commands the Curators and watches over all the Chapter’s relics whilst they remain on the Arc and any relic that should be moved must go through him. Always near the Vault at all times of the day he and the Lord Paladin are the only ones who can open it without consequence, opening the great door at the end of every day for the Curator’s under his care to go in and perform their duty.

Being one of the few on the Chapter’s Council it is his duty to relay all concerns or discoveries to the Paladins and Lord Paladin. Rarely ever going to battle he is still one of the deadliest Astartes on The Ark, rumored to match the Lord Paladin himself.

TechMarines
Commanding the Servitors of the Chapter they bless and maintain the weapons and vehicles of the Formations they stand with before a battle. Spending decades learning from the Tech Priests of Mars they come back to the Chapter as beings who speak to and for the Machine Spirit. Commanding a small force of Servitors on the battlefield he will bring more to work in excavation missions.

Forge Lord (Master of the Forge)
Working alongside the Explorator in the depths of The Ark he works to maintain and guard the technological discoveries made by the Chapter while providing his insight into the Machine Spirit of every vehicle owned by the Chapter. Leaving his work unattended only should a meeting of the Council be held.

Hospitallers
he medics of the Chapter who go into battle and work to keep their fellow Astartes alive or extract their Geneseed should they fall in battle. Their primary purpose is to aid in the creation of an Astartes through their gene therapy and their Gene-Seed and organ implantation. Most working within the Chapter’s Apothecarion.

Lord Hospitaller
As master of the Apothecion he organizes the placement and work of every Hospitaller in the Chapter. Never leaving the confines of The Ark his role is to protect the Chapter’s Gene-seed and lead tests for future recruits for the Chapter with the assistance of the AdMech.

Formation Ancient
The flag bearers of each Formation walk into battle alongside the Paladin and his HQ, holding high a flag that displays the very Formation’s emblem and fighting alongside his brothers. Running into battle with the Curator he rallies his brothers alongside him to strike down the foes of mankind. The words of the Curator and the sight of the Ancient are enough to drive any Astartes to look death in the face and laugh as they cry out their loyalties to the Emperor and his Imperium.

Veteran Marines
Powerful soldiers from both the 1st and 2nd Formations they have received centuries of battle experience through countless battles from the other Formations before they join these ranks. Trained to use all forms of combat to tackle all situations they’re also ready to equip and battle with the Chapter’s Terminator armour. Broken into teams of “Sternguards” or “Vanguards”.

Honour Guards
Like most Chapters Twentyfour exist within the Chapter. Though unlike most Chapters, Four guard and fight alongside the Paladin of each Formation and the final Four stand alongside the Lord Paladin. Promoted from the ranks of the 1st or 2nd Formations through their Veteran Squads. This was decided by the Chapter because the smaller command force of each Formation compared to their numbers made the life of the Paladin vital. Should the Paladin fall in battle these powerful Astartes would stand in his place till an official replacement is decided by the council.

Combat Doctrines
The Omni Legion is built upon warfare of every kind ranging from infiltrating enemy lines in order to take them out within to leaving nothing left through overwhelming numbers. Plasma, Melta and Lasguns are the most popular weapons for the Chapter because of the Forge World of Roithea specializing in such weapons, despite this they are still trained as effectively in melee combat. The only melee specialized troops are Assault Marines, Terminator Squads or the Chapter's Dreadnoughts.

Typical strategies of the Chapter involve melee focused teams charging the enemy while ranged units stand by creating a defense line. Infiltration and Tactical Squads moving in from the flanks to attack the distracted foes who are already avoiding being shot at from a distance while engaged in close combat.

It has become normal for these Legionnaires to prefer force or power weapons for melee and see the Chain weapons less effective and the sounds they make make ambushes more troublesome.

The HQ Squads of each Formation are led into combat by the Formation’s Curator (Chaplain) rather than the Paladin. Followed by the Hospitaller (Apothecary), Sorcerer and the Formation's Ancient.

Chapter Beliefs
The Omni Legion will come to the aid of those of the Imperium if they're in their desperate hour. Believing the people who swear their loyalty of the Emperor of mankind are worth protecting, the Marines of The Omni Legion would stand between a group of civilians and an Ork firing squad. Despite this the Chapter’s duty does mean that should something as grand as an STC be involved then they must protect it at all costs, even if it means leaving the innocent or even fellow battle-brothers behind to perish in battle. The Chapter would never risk the lives of a planet’s populace without attempting another method, such as attracting the attention of all the enemies or working to evacuate cities before a battle can break out.

Like many Astartes they don’t view The Emperor as a divine entity and worship of him as such is frowned upon among the Astartes. Though they don’t interfere with such worship or force their own beliefs upon other Astartes or citizens of the Imperium of man. The Omni Legion believes the Omnissiah is in actuality the the Emperor of mankind, thanking the Emperor for things ranging from the bolters in his hands to the very ships they stand in.

Gene-Seed
The physical appearance of the Astartes is relatively average with a lighter skin tone and dark but cloudy eyes. The average height is once more average for Astartes.

Genetic Idiosyncrasies/Mutations
The Psykers of the Chapter are capable of sensing the presence of Imperial metals from worlds away. Though unable to know exactly where it is he can simply feel its presence. This phenomenon seems to only happen when the Chapter is dealing with Imperial weapons, vehicles or other constructs, it is unknown if this is a mutation of the gene-seed or of an exposure to the warp.

After being rediscovered by the Imperium there have only been 2 mutations to their gene-seed organs found after thorough tests and examinations.
 * 1) The Betcher’s Gland, similar to the Imperial Fists and Raven Guard Chapters. The Omni Legion doesn't have access to this organ’s abilities to spit acid or digest food easier than the average Astartes.
 * 2) The Occulobe:  Astartes of this Chapter are very sensitive to ultraviolet rays, when leaving their ships they are to keep their helmets on at all times to ensure they don’t get irritated. It won’t cause any permanent damage but it’ll make it difficult for the Marine to see anything unless they have something to help block those rays. Their eyes have a dark but cloudy appearance.

Additionally Astartes of this Chapter seem “calmer” than some other Space Marines, not as though they’d seek a peaceful resolution rather than fight but they’re capable of maintaining their composure even in the presence of the enemies of mankind. This is mostly present against the Eldar and Tau. Further details listed later.

Records are kept close to the Adeptus Mechanicus and the High Lords of Terra as all further research and tests are carried out even in the modern age.

Dark Angels
Research from the Adeptus Mechanicus doesn’t support this theory as few records of their successors have been kept. One link considered between the Chapters is due to the Dark Angel Successor Chapter Guardians of the Covenant because of similar ties to the Adeptus Mechanicus. The Guardians of the Covenant treat the common citizens of the Imperium with a similar level of care.

The Gene-Seed of the Dark Angels is considered too pure to be possible as a candidate due to the mutations that exist in the Omni Legion Chapter. This could however be a result of their exposure to the warp.

[No other theories are available]

White Scars
Tactics of the White Scars are far too different to have any reasonable theories. The mutation of the Omni Legion which requires them to wear helmets and the lack of any Bike Squads which are both traits the White Scars are famous for.

[No Theories are available]

Space Wolves
Similar to the White Scars the culture of the Space Wolves but also lack of any true Successors once more makes this impossible. The appearance of the Omni Legion is much less hairy than any Space Wolf, they all seem to have average sized teeth. Nothing in the Chapter is documented to be in any way similar to the Canis Helix during the process of creating a new Astartes.

[No Theories are available]

Imperial Fists
The gene-seed defect that causes the loss of the use of their Betcher’s Gland makes for a good argument that the Omni Legion may be a successor Chapter to the Fists but the Sus-an membrane makes it at the same time difficult for this to be the case. This organ allows Marines to enter a state of self hibernation that can last for hundreds of years.

A current rumour is that they are truly the remains of the Astral Knights who vanished shortly after the destruction of the Necron World Engine and when they were to be replaced by the Sable Blades Chapter. This is theorized despite the Astral Blades only being recently devastated, many propose the idea that the Knights were lost in the warp and actually traveled to the past. This is impossible though because the final Chapter Master of the Astral Knight was Brother Thade who was a Dreadnought that was accompanied by only 30 battle-brothers in a single ship.

Their experience in melee combat has made them stand out from the Fists while Omni Legionaires prefer non-chain weapons. In addition the strong presence Psykers hold in the Chapter makes a relation to the Black Templars impossible.

[No other theories are available]

Blood Angels
The appearance of the Blood Angels and the lack of any of their genetic defects within the Omni Legion makes the possibility of them connected to them another unlikely scenario. The physical examinations and documented actions of the Chapter by the Adeptus Mechanicus proves that both the Black Rage and the Red thirst is absent from them..

[No Theories are available]

Iron Hands
The way the Omni Legions look at technology and their dislike of replacing their limbs unless no other choice is left makes them a successor to this Chapter unlikely. Due to previous run ins with the Iron Hands resulting in confrontations in morals and tactics this is also another argument against this possibility.

[No Theories are available]

Ultramarines
Unsurprising because the Ultramarines provided the most successor Chapters after the Horus Heresy they’re looked to as a very likely progenitor of the Omni Legions. The pure Geneseed of the Ultramarines could very similar to the Dark Angels have become tainted and mutated through the long time the Omni Legion spent in the warp.

How much the Chapter diverges from the Codex Astartes decreases these odds of being a successor but their culture could have very much changed as a means for survival even after returning and joining with the Mechanicus.

[No other theories are available]

Salamanders
The Genetic mutations of this Chapter makes such a concept impossible. Though allied with them the Omni Legion don’t follow any of the same tactics as the Salamanders, only similar to their care for defending civilians of the Imperium.

[No Theories are available]

Raven Guard
The dark eyes of the Omni Legion are like that of the Ravens. The skin tone of this Chapter is pale while, even more than the Blood Angels. Strategies of stealth, hit and run tactics are one of the many used by the Chapter but it’s typically limited to their Initiate Squad Infiltrators or their Reiver Squads.

DeathWatch Service
Veterans of the 1st Formation may be picked to join the DeathWatch, serving their vigils with Watch Fortresses "Prescience" or the "Eye of Damocles". Most commonly the members of the Chapter that join the Deathwatch are Astartes trusted with the use of Plasma or Las-weaponry due to their experience with such. Rarely do members of the Chapter make use of the DeathWatch Terminator armour unless absolutely necessary. Veterans of the 1st Formation once they finish their service to the DeathWatch are transferred to the 2nd Formation. Reasons for why can only be suspected that the Chapter doesn’t want to risk mixing brothers who are expected to keep a calm demeanor around xenos with Astartes who have been expected to and ordered to slay every type of xenos they encounter.

Dark Angels
There are very few records of the Omni Legion encountering the Dark Angels until recent centuries. Typically when this occurred, it would be at the scene of a Space Hulk. The earliest entry is both Chapters arriving at a Space Hulk in the year 896.M34. The Angels themselves didn’t seem to take issue with the Chapter being present at the Hulk. After finishing their work the Dark Angels left the Omni Legion to harvest the Space Hulk for relics and ancient technology for the next few months. What the work was is unknown to the Omni Legion as this information was kept to the Dark Angels themselves and the Omni Legion didn't press.

Both the Dark Angels and the Omni Legion are very secretive, but for very different reasons - for the Omni Legion it's what they recover on expeditions and the Mechanicus finds useless for their research. At least that’s what is seen by the rest of the Imperium. Both factions have worked more frequently with one another as millennia passed, each providing intel about various matters.

Ultramarines
They're not fond of the Ultramarines’ strict and aggressive nature toward anyone who doesn’t strictly adhere to the strictures of the Codex Astartes. The Ultramarines often tends to pry into the Omni Legion’s work often, especially when they are near the borders of Ultramar during their missions. Despite this the sheer number of successor Chapters they have and the proximity to Ultramar would be a fool's desision not to ally themselves with the thirteenth First Founding Chapter.

After the return of Roboute Guilliman and the rise of the Primaris Space Marines, the opinion of the Ultramarines became rocky because of the forceful introduction of the Primaris Marines, though the aid they provided has helped these feelings improve for the most part, within the Chapter. The return of the Primarch also saw the improved plasma weapons through the newly inducted Hellblaster squads, which greatly pleased the Omni Legion.

Salamanders
Relations between the Salamanders and the Omni Legion is very good because of their similar outlook on their Serfs and the Imperium’s citizens. The Chapter sometime lends aid to the Salamanders if they believe they’re close to finding one of the Artefacts of Vulkan, though this has never truly yielded results. Working with the Salamanders has become one of the greatest honours among the Omni Legion.

The Second Formation of the Omni Legion, due to their more common use of Melta and Flamer weapons, work best with the Salamanders in actual combat. In battle, fighting side-by-side, the flames wash over the Astartes armour.

The close proximity of Nocturne to the Forge World of Roithea and Tallon V means both Chapters work with one another frequently.

Astra Militarum
 The brave men and women of the Imperial Guard make up the bulk of the Imperium’s military might and the Omni Legion aren’t ignorant to this fact. Numerous times the Chapter has come to their aid. Despite the history of Space Marines basically stealing the glory of victory and leaving the Guard with nothing but their dead, members of the Omni Legion don’t fall under this and have nothing but respect for the forces of the Astra Militarum for facing such unbelievable odds.

The first time the Omni Legion notably encountered the Imperial Guard after their refounding was a mere 2 years later. In the year 843.M34 on the planet of “Patron” the Imperial Guard of the world attempted to hold off an Ork siege for months until Drop Pods fell from the sky and teams of 3rd Formation Space Marines stormed the lines to aid the Guards. Within days the 4th Formation arrived and with their assistance the forces the Orks were wiped out.

Understanding the Guard’s dislike for many Astartes, the idea of fighting for months or even years and then another force coming in to take what satisfaction you could have. The Omni Legion do what they can to make the Guard feel accomplished and will not stray from any details when speaking of the bravery of any Guardsmen.

Adeptus Mechanicus
Thanks to Roithea aiding in the recovery and rebirth of the Chapter after their time lost in the warp the entire Chapter believes themselves to be indebted to the Adeptus Mechanicus as a whole. When orders from the Cult come in the Omni Legion are fast to act and race to complete their missions. Despite these orders from the Mechanicus the Chapter is still given freedom on HOW they accomplish these missions as long as they fulfill their purpose.

Many times the Chapter itself will find their own way to the technologies sought by the Mechanicum. All tension that could exist between the Chapter and the Mechanicus doesn’t exist as the Mechanicus holds a presence on The Ark at all times and the Forgeworld of Roithea supplies the Chapter with all the weapons they need, especially plasma, melta and las weapons.

Adepta Sororitas
 The zealot behavior of the Sisters of Battle frequently turns the Omni Legion away from wanting to serve with them because of the Sisters willingness to kill anyone who they believe is a heretic.

The first time the Chapter met the Adeptus Sororitas was in the year 393.M36, when they were once known as “The Brides of the Emperor”, in which the world’s populace was thrown into a state of civil war. As the 3rd Formation attempted to destroy the resistance it took mere hours for the rebels to throw down their weapons and surrender to the Legionaires. Days later the Sororitas arrived on the world with the Imperial Guard and to the shock and anger of the Astartes they begun slaying every citizen, even those who never held a weapon as they set hospitals and shelters ablaze. Not allowing a single potential heretic survive this day.

Furious by this the Paladin took to orbit to speak personally to the Canoness about this. He towered the woman but she wasn’t threatened by this Marine. Warned that such a reaction to this situation could make the Ecclesiarch suspect that he was defending the traitors of Goge Vandire and he could be a heretic himself. Speechless at such a claim the Paladin could do nothing but apologize to the Canoness and turned to leave with his brothers. For a time the Chapter would refer to the Adeptus Sororitas as, “Vandire’s Vixens."

Even after The Age of Apostasy the only Order the Omni Legion will agree to working with is the Order of the Argent Shroud because of their more selfless attitude and outlook on the Imperium. Specifically the Order of the Sanctus Flame which works close with the Chapter as their Order was founded and is based on the world “Tallon V” which had been claimed by the Astartes. The Order is known for accompanying several of the Chapter’s Formations as reinforcements that infiltrate behind enemy lines to take out commanders or a primary source of negotiation because of the more human appearance the women possess. Many men with power to do as they wish and either join or surrender to the Imperium. Additional information on this Order is disclosed later.

Relations to Xenos races
Much like how the Omni Legion on’t hesitate to turn a bolter to agents of Chaos there are countless Xenos races who would suffer a similar fate...some more than others.

The Tau Empire
The Tau aren’t a faction they will engage in combat on sight. However if they don’t heed their warnings to stay back they’ll attempt to wipe the Tau out, if they retreat they won’t pursue. Despite the proximity the Omni Legion’s investigations and patrols place them to the Tau empire they have rarely encountered them. Such events only occurring in the last millenia.

If the Chapter can identify a soldier of the Tau Empire as a human they will wipe out all Tau resistance and forcefully take the human deserter to subject them to questioning by the Inquisition, beyond that the Omni Legion don’t care what happens to the traitor. The DNA bound weapons of the Tau only have any value to The Chapter if they're from a human, another reason they are so eager to capture these humans.  

The Eldar
The Omni Legion never seek conflicts with other Xenos races such as the Eldar because they believe that neither faction would benefit from it. The sight of an Eldar Craftworld will make the Astartes wary to them but only keeping an eye on them should they get too close to their fleets or the world they’re investigating.

The only Eldar faction they ally themselves directly with is the “Ynnari”, very similar to many within the Imperium this is due to the aid in the resurrection of the Ultramarines Primarch “Roboute Guilliman”. The 2nd Formation despite their anti-xeno outlook will work alongside these Eldar for this reason.

The Dark Eldar
[in progress]

The Necrons
The mission of The Omni Legion means that the risk of encountering Necrons is much higher than most other Astartes. They have come to blows with these mechanical foes countless times. There has never been an attempt to converse with these beings after one initial contact that ended with a conflict that last 50 days and 49 nights. Necrons technology is banned from being brought aboard any land or aerial transports let alone The Ark because the Chapter doesn’t want to risk the chances of Necrons being able to taint their Fortress Monastery.

The most prominent figure of the Necrons that gets the attention of the Chapter is the Necron Overlord “Trazyn”. Upon learning of a Necron Overlord who holds such a large collection of relics there have been countless attempts to capture or find him, Trazyn himself has attempted to do the same with members of the Chapter.  

The Orks
Due to the location of the Forgeworld of Roithea they encounter attacks from the Ork Empire of Charadon on many occasions. Always ending with the Ork fleet being wiped clean from the stars. The green skinned Xenos frequently comes to blows with the world's Titan Legion.

Since the Chapter frequently moves between Roithea and their next target for investigation the Orks have tried catching onto their patterns and attempted to catch them off guard. Most times it's after The Omni Legion leave Roithea or when they deploy most of their forces to search. The Orks will attempt to use overwhelming numbers to fight the Chapter to no avail.

The Tyranids
Negotiations are not an option. Kill them on sight. If a planet is suspected to hold either of these species the Omni Legion will deploy the 1st, 2nd, and 4th Formations to destroy every Xeno they can find. This is however very rare as the duty of the Chapter isn't to hunt Xenos. If orders are however to deal with such a threat in the event another Space Marine Chapter, the Ordo Xenos or Imperial Guard are unable to reach the world before them then they’ll do what needs to be done.

Obviously this includes all forms of Genestealer cults and the worlds they inhabit. It brings great grief to the Astartes should they need to wipe out an entire planet's populace but in order to protect mankind and preserve the galaxy it must be done...

Chapter Colours
The armour of the Omni Legion primarily have a silver colour scheme with a red trim along the pauldrons, knees and the plating covering the stabilizing jets of their backpacks. Every Legionnaire has blue eyes on their helmets. Sergeants are to wear older models of helmets to help them stand out better among their brothers and display the Astarte's legacy. Paladins (Captains) aren't held to a specific code and are free to appear as they please as long as they display the emblems of the Chapter and their Formation.