I’d like to begin by saying that my theory is not canon and should not be taken as such.
I have some reservations about the Lost Legion, a robotic faction controlled by AI and created by the Marcher World. They seem to lack a clear purpose in this setting, especially if they are supposed to be highly rational like the Empyrean. My main question is, what is their conflict with the other factions? Revenge against the Marcher World doesn’t make sense, since the Lost Legion were lost and likely not advanced AI when they lost contact with the Marcher World. Why would they hate humanity as a whole? They could be after the arc surplus, but they don’t have cities or trade to require large amounts of arc. Arc would mostly be used to keep their home ships running and their metal chassis maintained. Control of the Void gates to go back home? They could just wait at the Void gate they came out of, and they are essentially immortal. Opening more Void gates to bring in more Lost Legion? But why would they need more, since they don’t need planets or human resources? And, unlike the Empyreans, why would they care about arc usage in the galaxy? So, I’ve come up with my own theory about the Lost Legion’s origin that makes more sense in the Warcaster Neo-Mechanika universe, starting with the Void Wraiths.
I believe that the Void contains void energy, which contrasts with arc energy. Arc is not just a type of energy but can also manifest as cyphers and be used as a medium to write scripts or instructions. It has the power to manifest the will of a sentient being into reality. Void energy, on the other hand, is different. It converts living organisms into void energy and scatters their consciousness into a web of other consciousness. The Void is highly unstable and, therefore, unsuitable for sustaining life. The environment constantly pulls and pushes the particles of living cells, and nothing can stop this except for arc energy.
While sentient beings do exist in the Void, they are unable to maintain a form for long periods of time. This is why Phaetheon wears the mantle when he becomes a Wraith. The Mantle helps stabilize his form and contains the void energy that he becomes when he dissolves without a physical vessel. One of the reasons why he dissolves so quickly is because his Wraith form is a combination of void and arc energy clashing. In testing from AC, subjects with more arc energy would explode, while those with too much void energy would dissolve into nothing. It is worth noting that while dissolving, test subjects would become insane, and in some cases, they were able to drive others insane after “death”. The balance of energy allows Phaetheon to maintain his form and his mentality for a short amount of time.
Phaethon is essential to this theory. When a creature of the void enters physical space, it can temporarily maintain a physical form for a relatively short period of time, depending on the amount of condensed void energy. If the void creature can find a living host or an arc container (like Phaetheon’s mantle), it can potentially live in physical space forever.
So what does this have to do with the Lost Legion, the robotic faction? My theory is that the Lost Legion is a group of sentient void creatures that inhabit the shells of the Robots, and are led by an all-power void creature that acts as a type of master computer AI. How is this possible? If the robot was sent into space were powered with an arc the could serve as a container for the void creatures. Why wouldn’t they possess human creatures? I had another theory that to use absorb arc sentient creatures developed a type of cells that process arc, or like a script, arc can be programmed into electronics. Their cells and components do not degrade soon after death, and the dormant Arc energy repels the void energy. They are able to control the robots because they use arc energy, but do not have “scripts” programmed in them like the cortex of warjacks. It is possible for them to possess a living creature that produces little arc, but they often mutate the form as the arc in the living organism clashes with the void energy until it submits. So what do they want? I think the Master void creature wants to push more creatures out of the void gates to exist in a physical form. The long-term goal of the Lost Legion is to eventually find an organism that can reproduce and truly live in physical space. What conflict does this cause between factions? ISA and Empyreans have a strong focus on controlling void gates, and this makes it so that a 3rd faction is also trying to control void gates. The only LL purpose is to bring more void creatures to bolster their war effort. Until they find the organic organism to inhabit they are bound to the robotic form, and to make more soldiers they need material. This would cause them to fight MW for raw materials. For the AC they want to understand the technology void energy can produce and will try to capture and extract void energy and information from the LL. Because the AC has the habit of obtaining rare ancient artifacts from a time long ago (potentially when void creatures and void energy were more common) they seek to take them for their own research.
It isn’t perfect, but it makes more sense to me than a highly rational and intelligent AI unit doing stuff for what seems like illogical reasons. Anyway thanks for reading my fan theory, and let me know what you think or any questions.