Another concept is the potential power they might have had. Given that the known primarchs were incredibly powerful, the lost primarchs could have had unique abilities that would have changed the course of the Warhammer 40k universe. For example, they might have had a different approach to dealing with the xenos threats, which could have led to a very different state of the galaxy.
Some fanfictions explore the idea of the lost primarchs having a secret legacy. This could be in the form of hidden technology or a hidden group of followers who still uphold their teachings in secret. It creates a whole new layer of story possibilities within the already vast Warhammer 40k universe.
Some fanfictions might center around the battles between different Primarchs. For instance, the confrontation between Horus and Sanguinius. In these stories, the authors often delve into the tactical aspects of their warfare as well as the emotional turmoil of the Primarchs. Additionally, there are fanfictions that show the Primarchs interacting with normal Space Marines in unique ways, perhaps mentoring them or learning from them in some cases.
Another popular interpretation is that the lost primarchs were secretly working against the Imperium all along. This could involve them allying with chaos or other enemies of the Imperium, and their disappearance was part of a long - term plan to undermine the Imperium from within. Fanfictions based on this idea often involve complex plots and political intrigue within the Warhammer 40k setting.
One interesting concept could be the evolution of the factions. For example, how the Space Marines might have developed new combat tactics or even new genetic enhancements. Another could be the exploration of new planets and the strange alien species that might be discovered. Also, the political intrigue within the Imperium could be a fascinating aspect, like the power struggles between different segments of the military or the Adeptus Terra.
Some interesting concepts in Warhammer 30k fanfiction include the loyalty and betrayal within the legions. There are stories that show how a single act of betrayal can have far - reaching consequences for an entire legion. The psykers in this setting also offer great potential for fanfiction. Their powers and how they are controlled or go out of control can be the focus of many stories. Additionally, the relationship between the Space Marines and the Mechanicum is another area that fanfiction often explores, with different takes on their cooperation and conflicts.
Horus is often very popular in fanfiction. His fall from grace is a major event in the Warhammer 40k lore, and many fanfiction writers like to explore the reasons behind it more deeply. They might create alternate timelines where he doesn't fall or explore his relationships with other Primarchs in more detail.
Well, the idea of power - gaining in Warhammer 40k si fanfiction is quite cool. A self - inserted character could potentially gain psychic powers and have to learn to control them in a universe where such powers are both feared and respected. And the technology aspect is fascinating too. They might get their hands on some ancient and powerful weaponry or technology from a lost civilization. Plus, the fanfiction often delves into the relationships between different characters. An si character could form an unlikely alliance with a Space Marine or a Rogue Trader, which would be full of drama and adventure.
One interesting concept could be the combination of RWBY's unique semblances with the grimdark and highly militarized setting of Warhammer 40K. For example, a character with Ruby's speed semblance might be an extremely effective scout or assassin in the 40K universe. Another concept could be the clash of the different factions in 40K with the teams from RWBY. The Imperium's strict dogma and the more free - spirited nature of RWBY characters could lead to some really engaging storylines.
One interesting concept is the idea of a character being reborn with their past memories intact. This can lead to some really cool storylines where they use their knowledge of the past to change the course of events in the Warhammer 40k universe. Another concept could be the reincarnation of a powerful hero or villain, which can completely shift the power dynamics in different factions.
One interesting concept is the idea of perpetuals themselves. They are immortal beings in the Warhammer 40k universe. In fanfiction, they can be explored in various ways, like their relationships with other factions. For example, how a perpetual might interact with the Imperium, either as an ally or a potential threat.
One interesting concept is the crossover with other popular sci - fi universes. For example, a crossover with Star Wars could have the Imperium of Man facing off against the Galactic Empire. Another concept could be the combination of different Warhammer 40k factions in unexpected ways within the fanfiction. Maybe the Space Marines teaming up with the Orks against a greater threat.