Numerous fluff in the mass of 40K has us get new groups, even new regiments, that started out as two or more existing regiments, who, over the long, merciless span of the war, have been ground down, suffered significant casualties, and been without similar reinforcement. In the end, the two groups might say to hell with it, and team up, allowing a group that is both Cadian and Catechan, or Tallarn and Elysian. While the regiment building chapter is actually rather simple, and I appreciate it, I am wondering how my fanfic regiment, the 1st Lokarin, should be handled. In their story, they start out as a force of Cadians, sent in to assist a force of Elysians, in handling some problem. Numerous things happen, causing the Cadians to have to assist, but not necessarily in their normal way; their heavies never show up, or much later, and so the Cadians have to learn to work more with less bulk, and then the tanks DO finally arrive, and the group is reinforced. When everything is done, they have a composite force, called the 1st Lokarin, after they are sent to that system, for a mission, that allows them to hold a position, and remove obstacles, while maintaining fast, agile scouts, in the form of the Elysians, who can do what they do, but then still withdraw to fortified Cadian killzones, and regroup, while the Cadians obliterate the depleted pursuers, and the day is won.
The simplest thing, of course, would be to just say, "if you are 1st Lokarin, either build as Cadian, or build as Elysian, and SAY you are 1st Lokarin, which I would like fine, but I'm not sure if that would work, or if I would have to try to fangle up a build that is part-Cadian, part-Elysian, and use the rules in the chapter. They do have many things in common, but a few key differences, so I thought I'd ask. Much of the game seems like it could run like Deathwatch, with a DW kill-team comprised of a Blood Angel, an Ultrmarine, a Raven Guard, and a Storm Warden, each their own Chapter, but belonging to the same group, but I don't know if Only War expects you to more conform to "the unit you are in is all Catechans, now build your unique character from there", or if the many, beleagured fronts all comprise numerous regiments, and each Player team can consist of Janissaries, Cadians, and Vostroyans, who have been assembled due to casualties, plus complimentary skill sets. If you can say "the 1st Lokarin is on the field", and it comprises Cadians and Elysians, and that works, hazaah, but if they have to have "1st Lokarin regiment rules" not as good for me.
As an aside, the planet in my story where this regiment is active, Titan's Rest, in the Lokarin System, is a normally uninhabited, heavily forested world, with a single valuable resource, and a large number of recent-arrival Orks. What sort of designation might such a planet receive? It could support life, but just doesn't, on a people-level (there are primitive animals, like any forest) and has one Human-built fortress, along with an undetermined infestation of Orks. Were I to build the 1st Lokarin as a regiment, what type of world would Titan's Rest be considered? Thanks.