One interesting plotline could be their battles against the xenos threats. The Imperial Fists are known for their tenacity in combat, and the novel might detail their strategic maneuvers against various alien races.
The Imperial Fists' relationship with other Space Marine Chapters is also likely to be an important plotline. They may have to cooperate with other Chapters in the face of a greater threat. Their interactions, the sharing of resources or the clashes due to different Chapter cultures can be really engaging. The novel could explore how they work together or sometimes compete while still being on the same side in the grand scheme of the Imperium.
One of the great 'Imperial Fists 30k' novels is 'The Horus Heresy: Pharos'. It delves deep into the lore of the Imperial Fists during that era. It shows their unwavering loyalty and their struggle in the face of the growing chaos.
There might be a Chapter Master as one of the main characters. He would be in charge of leading the Imperial Fists, making crucial decisions in battles and for the future of the Chapter.
I'd also recommend 'Mortis'. It provides a different perspective on the Imperial Fists. It shows their internal dynamics and how they deal with the challenges not only from the outside enemies but also from within their own legion.
There are several notable Imperial Fists novels. 'The Emperor's Champions' is one that stands out. It tells the story of how the Imperial Fists live up to their reputation as the Emperor's own. It showcases their unique characteristics, like their strict discipline and their ability to hold the line in the most difficult of battles. Another good read is 'Forge of War' which details their military operations and how they are an integral part of the Imperium's military might.
Some of the well - regarded Imperial Fists novels include 'The First Wall' which delves deep into their early battles and the indomitable spirit of the chapter. It shows their unwavering loyalty and the strategies they employ on the battlefield.
One interesting plotline could be about a low - level gamer character rising through the ranks in the Warhammer 40k universe. They start with a small, weak force and gradually build it up into a powerful army, facing challenges like rival factions and difficult terrains.
The plotline about the Dark Angels Space Marine chapter is also captivating. They have a dark secret in their past related to the Fallen Angels. They are constantly on a quest to redeem themselves while still serving the Imperium. And the story of the Sisters of Battle, a female - only military order in the Imperium, is full of tales of faith, combat, and loyalty.
One interesting plotline could be a Space Marine finding himself in a situation where he has to protect a group of diverse female characters from different factions in the Warhammer 40k universe. This creates a harem - like dynamic as they all rely on him and he has to navigate their different personalities and abilities.
A really cool plotline could be centered around a real - life military unit that somehow gets their hands on some Warhammer 40k - like technology. They start using it, but then attract the attention of the Inquisition - like forces from the game's lore. They then have to prove that they are not heretics while also dealing with the new - found power and the consequences that come with it.
One interesting plotline could be a Dark Eldar raiding party stumbling upon a lost Imperial relic. They see it as a valuable item to either use for their own dark purposes or sell on the black market in Commorragh. Another could be a story about a Dark Eldar wych who tries to rise through the ranks by challenging powerful rivals within her own cult.