Probably 'Horus Rising' by Dan Abnett. It's a very popular one as it sets the stage for the Horus Heresy, which is a huge part of the Warhammer 40,000 lore. It gives a great introduction to Horus as a Primarch before his fall.
One great starting point could be 'Fulgrim' by Graham McNeill. It delves deep into the character of Fulgrim, one of the Primarchs. It shows his journey, his fall from grace in a really engaging way.
The 'Gaunt's Ghosts' series, especially 'First and Only', is also very popular. The series has been around for a long time and has a loyal fan base. People love the relatable characters and the gritty war - time stories it tells.
Ava is also quite popular. She is usually written as a brilliant strategist. Her fanfiction stories often involve outsmarting her enemies through complex and innovative battle plans. She is seen as a symbol of female intellect in the world of the primarchs.
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.
One popular Black Library novel is 'Horus Rising'. It's a great start to the Horus Heresy series, which delves deep into the events that led to the fall of the Imperium. Another is 'Gaunt's Ghosts' series. It follows the Tanith First and Only regiment through their many battles in the 40K universe. And 'The First Heretic' is also quite well - known, as it shows the origins of the Word Bearers' fall from grace.
Many fans consider 'Horus Rising' to be one of the best. It's so important in the overall Warhammer 40,000 lore as it sets up the Horus Heresy, which is a huge part of the universe's story. The way it shows the early days of the Imperium and how things start to go wrong is really captivating.
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.
Well, 'Da Red Gobbo' is a great Black Library ork novel. It shows the ork society from the perspective of a grot, which is really interesting. And then there's 'Brutal Kunnin' that explores the orks' unique brand of warfare and cunning in a really engaging way.
One of the most popular is 'Sword Art Online'. It has a huge following both in Japan and around the world. The story about a virtual reality MMORPG gone wrong and the adventures of the players trapped inside is really captivating.
A good example is 'The Night Lords' trilogy. It gives an in - depth look at the Night Lords Chaos Space Marine legion. It shows their brutal and somewhat unorthodox tactics. Another notable novel is 'Fulgrim', which is part of the 'Horus Heresy' series and focuses on the fall of the Primarch Fulgrim to Chaos.