In the Warhammer 40k War of Secrets novel, it's possible that there are main characters from different factions. There might be a tech - priest from the Adeptus Mechanicus who is trying to unlock some technological secrets. Or perhaps a Commissar who is involved in uncovering some political secrets within the Imperium. There could also be a Chaos cultist whose actions drive part of the story as the Imperium tries to root them out.
The Warhammer 40k War of Secrets novel likely has key events centered around the struggle for power and survival in the grim darkness of the far future. It may involve a race to uncover some ancient and powerful artifacts. There could be a power struggle within the Space Marines chapters or between the Adeptus Mechanicus and other Imperial forces. The revelation of secrets could also change the balance of power between the Imperium and its enemies like the xenos races or the forces of Chaos.
The 'Warhammer 40k War of Secrets Novel Audiobook' is set in a vast and dystopian universe. It likely tells a story full of conflict. There could be internal strife within the different factions. For example, the Imperium might be dealing with heretics or traitors within its own ranks. The story might also involve the search for knowledge or power that is hidden away. The audiobook will bring to life the rich lore of Warhammer 40k, with detailed descriptions of the settings, from the decaying cities of the Imperium to the otherworldly landscapes of the alien races. And of course, there will be a lot of tense moments as the characters face off against their enemies in the never - ending war for survival and dominance.
Some libraries also offer audiobooks for borrowing. Check with your local library to see if they have the 'Warhammer 40k War of Secrets Novel Audiobook' in their collection. They might even be able to order it for you if they don't have it currently.
I don't know for sure, but it could be the Space Marines. They are often central characters in Warhammer 40k stories.
One of the main characters is Ciaphas Cain. He is from the 'Gaunt's Ghosts' series. He is a bit of a reluctant hero, always getting into and out of trouble in the most interesting ways.
The Blood Ravens are the main characters in the Warhammer 40k Dawn of War 2 story. These Space Marines are known for their combat prowess and their thirst for knowledge. Their Librarians, who possess psychic powers, are also significant. Among the enemies, the Tyranids' bio - forms like the Hive Tyrant are important as they pose a great threat to the Blood Ravens and the Imperium. Additionally, there are other minor characters within the Imperium that play supporting roles, such as Imperial Guardsmen who assist the Blood Ravens in some of their battles.
The Empress herself is of course a main character. Often, you'll also find Space Marines, as they are a significant part of the Warhammer 40k universe and interact with the Empress in various ways. Imperial Guardsmen may also be present, depending on the plot of the fanfiction.
Without having read the 'War of Secrets Novel', it's difficult to name the exact main characters. However, considering the nature of the title, there could be a diplomat - like character. This person would be in the middle of the war, trying to negotiate peace treaties while also being aware of and using various secrets. There might be a young hero or heroine, perhaps naive at first but quickly learning about the world of secrets as the war unfolds. And there could be an old, wise mentor figure who has knowledge of past secrets that are relevant to the current war situation.
A Vampire Lord from a long - lost dynasty could be a main character. He might be trying to reclaim his former glory in the 40k universe filled with so many powerful factions.
In many of the novels, Asdrubael Vect is a significant character. He is a powerful and cunning leader within the Dark Eldar society.