Legiones Astartes is a community collaborative project that is set in an alternate timeline where the Codex Astartes was never introduced, and as a result, the Loyalist Space Marine Legions were never broken up into smaller Chapter. Instead, the Legiones Astartes were rebuilt and further expanded in order to bring about a Second Great Crusade to reunite all that was lost during the Horus Heresy. Though this is an Alternate Universe (AU) community collaborative project which does deviate slightly from established canon, some ground rules must be put into place in order to maintain a unified vision for this project as well as maintaining a high standard for the quality of content that is expected of our editors here on the Warhammer 40,000 Homebrew Wiki.
To begin, please ensure that you have read the Legiones Astartes community collaborative project page’s Overview and What is it? sections, in order to familiarize yourself with the project's background and setting. The following sections will give you an understanding about what you can, and cannot, write about when creating a Fanon Space Marine Legion. When creating a Space Marine Legion for the Legiones Astartes universe, please ensure you utilise the Infobox LALegions in order to keep your article uniform with other Legiones Astartes Space Marine Legion pages.
Also be sure to browse through the Space Marine Legions section on the Legiones Astartes project page, or the 'Ur-Legions' section on the Nova Terra Regency page, as there are already quite a few Legions that have been created. There might be one that is similar to one you had in mind to create. Though this is unfortunate, try to ensure that you create something unique and original, as this will avoid problems with being accused of plagiarization.
Please keep in mind that there are a limited amount of slots for the number of Space Marine Legions for this project. As it stands, the Space Marine Legions of the Imperium of Man possess approximately thirty, created over the ten millennia of its existence. Most of these have already been taken. But a few are still available. Currently, several Legion are still available. And since there are a total of thirty Legions, there are plenty available for those who wish to contribute. Remember, you don't have to write about a Legion that currently exists in the modern 41st Millennium. You can also write about a Space Marine Legion that met some unfortunate end during one of the ages of conflict that have continued to plague the Imperium down the millennia (lost in the Warp, wiped out by an unknown xenos species, an inter-Legionary conflict, ect.) The possible scenarios are endless!
If selecting a possible Space Marine Legion of the Imperium of Man doesn't appeal to you, perhaps you might want to write about one of the so-called Ur-Legions of the Nova Terra Regency, a sizable breakaway state that rules all of the former Segmentum Pacificus and some smaller territories beyond. They seceded from the Imperium in the 33rd Millennium during an eight century long conflict, which came to be known as the Nova Terra Interregnum, and were finally formerly recognised (albeit reluctantly) by the Imperium as a sovereign empire. In order to protect their borders and interests, there were those Space Marine Legions that also sympathized with the Nova Terran Secessionists, and seceded from the Imperium, and fought on the side of the Secessionist cause. Since that time, the Nova Terra Legiones Astartes, or 'Ur-Legions', have continued to defend the Nova Terra Regency's borders and have halted numerous incursions by the various factions within the 40K Universe. As it stands there are currently only three core Ur-Legions, but that doesn't mean you couldn't create a new one. There are numerous possible scenarios of how your Ur-Legion could've come into existence. They could've possibly been a later Founding (usually 3rd Founding or later) Space Marine Legion of the Imperium, that later broke away and joined the liberated sovereign empire for one reason or another. Or perhaps they were created following the end of the Nova Terra Interregnum. Your only limited by your imagination.
Before you begin the undertaking of writing about a Space Marine Legion, please keep in mind the following rules that you need to adhere to when creating your own Space Marine Legion:
*Size – One of the more important aspects when creating a Space Marine Legion is their size. Typically, most Space Marine Legions numbered anywhere from 7,000 on the low end of the spectrum, all the way to over 250,000 at the peak of the Imperium's technology during the latter years of the Great Crusade. These Legions are massive armies, and the size of each can vary tremendously. Some Legions are very large, while others are not. The size of each Legion is fluid, with the numbers of combat-ready legionaries dependent on the number of new recruits, the inevitable battle-losses, the availability of potential recruits, and the administrative skills of the Primarch or Legion Master and his officers. Therefore, it has been decided by the community that the following will be put into effect:
**Legions should typically number anywhere from 5,000 (least allowable amount) to no more than 150,000. Legions such as the Nova Blades which number in excess of 300,000-350,000 are a rare exception. If you wish to have a Legion that numbers larger than 150,000, please contact the project Lead Algrim Whitefang or Assistant Lead Achilles Prime. The leads will give due consideration to your request (provided the editor gives an adequate explanation). All requests will be considered on a case-by-case basis.
*Loyalist Traitors or Traitor Loyalists – This is often a very sticky issue with many editors. Due to the nature of the Legiones Astartes and the long term viability of a Shattered Legion or Blackshield force, the viability of maintaining sufficient gene-stock and technical competence, it is entirely possible for such formation to maintain its strength over a protracted period, provided they are able to recover zygotes from their fallen battle-brothers and are able to obtain a fresh supply of potential recruits. But keep in mind, a connection to a Traitor Legion would be considered a terrible dishonor and would most likely cast your Space Marine Legion into a negative light by your fellow brother-Legions. However, if you feel the need to create such a Legion, please contact one of the project Leads, and they will give your request due consideration on a case-by-case basis.