One of the great ones is 'Horus Rising' which sets the stage for much of the chaos in the Warhammer 40k universe. It gives a deep look into the fall of Horus and the start of the chaos within the Imperium. Another is 'A Thousand Sons', which delves into the story of the Thousand Sons legion and their fall to chaos. It has great character development and an interesting take on the chaos powers at play. And 'The First Heretic' is also a top pick as it shows how the seeds of heresy were sown among the Legions, leading to chaos spreading throughout the galaxy.
Fanfiction in the Warhammer 40k Chaos Gods realm can be really diverse. Some stories could be about the power struggles between the different Chaos Gods. For example, Tzeentch, the Changer of Ways, might be plotting against Nurgle, the God of Decay. Writers might also create new characters who are either lured into the service of the Chaos Gods or are trying to resist their insidious pull.
One main element is their fall from being Space Marines. They were once on the side of order but turned to Chaos. Another is the influence of the Chaos Gods, which is a huge part of their new identity. And their defiled equipment and appearance.
The Chaos Marines in Dawn of War have a dark and complex back story. They were once Space Marines who turned to Chaos. Corrupted by the powers of the Warp, they abandoned their oaths to the Emperor. Their armor and equipment became defiled, often taking on a more chaotic and menacing appearance. They now fight for the Chaos Gods, seeking power and destruction in the galaxy.
For a start, 'Angels of Caliban' could be a good choice. It has elements of mystery and the connection to chaos is gradually revealed. It's a bit different from the more straightforward chaos - centered novels but still gives you a taste of how chaos is intertwined with the different factions in the 40k universe. 'The Damnation of Pythos' can also be a starting point as it throws you right into a world being consumed by chaos, which can be really exciting.
Isha can be seen as a catalyst in many fanfictions. Her presence in the chaos realm stirs things up. She might be the key to a certain prophecy or the cause of a power struggle among the chaos factions. In some stories, her very existence in the chaos is what drives the plot forward as different characters try to either use her or protect her from the chaos forces.
One good one could be 'The Redemption of Isha in Chaos'. It explores Isha's journey within the chaos realm in an interesting way, with great character development.
The allure of Warhammer 40k Chaos Gods fanfiction lies in the sheer chaos and darkness it represents. It allows fans to explore the extreme and often disturbing aspects of the 40k universe that the official lore only hints at. For instance, the fanfictions can go deep into the psychological impact of being in the presence of the Chaos Gods on ordinary individuals.
Here are some recommendations for novels similar to the marines:
1. "Refusing Qinghua's postgraduate studies, my liver became an officer." Author: Yuze Guardian
2. I'm Really Here to Maintain Peace. Author: Ghosts Never Get Lost
3. Film and Television Begins with the SEALs, by Little Soldier
4. " The life of an admiral from scratch."
5. " I'm a commander in the army."
6. "I'm a special forces soldier in the soldier assault."
These novels covered different types of Marine stories, including military, military life, and military science fiction. I hope these recommendations will meet your needs.