Well, in the 40k tyranids short story, the Tyranids are presented as a force of nature. Their appearance is often grotesque and menacing. The stories might also explore how other races in the 40k universe react to the Tyranid threat. Some may choose to fight head - on, while others might try to find more strategic ways to deal with this ever - growing menace.
The themes in the 40k tyranids short story include the power of the swarm. The Tyranids operate in huge numbers, and this mass - action is a significant aspect. Also, there is the theme of the unknown. Since they come from outside the known galaxy, their true origin and full capabilities remain somewhat of a mystery in the stories.
It may be about the origin of Slaanesh in the context of the 40k universe. It could describe how this Chaos God came into being, perhaps through the excesses and extreme emotions of sentient beings. It might also involve the impact that Slaanesh has on different planets or civilizations, like how it corrupts them with its promise of pleasure and power.
Well, the '40k salvation short story' could be about a hero's journey to save a planet or a group of people in the Warhammer 40k setting. It might involve the use of advanced technology and the facing of great odds. For example, a Space Marine might be on a mission to salvage a colony from the clutches of the Tyranids or some other menacing force. They would have to fight their way through hordes of enemies and use their unique skills and weapons to achieve salvation.
It could be about the themes of salvation within the dark and complex Warhammer 40k universe. Maybe it focuses on a character's journey to find redemption in a world full of chaos and war.
The '40k eternal crusade short story' could potentially be about the journey of a particular group or individual within the 40k universe during the crusade. It could describe their experiences, the challenges they face such as facing powerful enemies, dealing with difficult terrains, and the moral dilemmas they encounter. It might also show how they grow and change as a result of this crusade, and how their actions impact the overall course of the eternal crusade.
There might be a story in 40k short story about the Eldar. Their advanced technology and mysterious culture make for a fascinating read. For example, their complex relationship with the warp and how it affects their society and actions.
Another type of main characters could be the leaders of different factions. For instance, the commanders in the Imperial Guard who lead their troops into battle against various enemies. Their leadership skills, strategic thinking and the challenges they face while trying to protect their people are often the focus of the stories.
Loss is a common theme. This can be the loss of comrades in battle, like in a story where a squad of soldiers sees their friends fall one by one. Another theme is sacrifice, such as when a character gives up their life or their future for a greater cause.
It's hard to say without reading the specific story, but it could be a Chaos Lord who serves Slaanesh. They would be a central figure, leading their followers in the pursuit of Slaanesh - inspired desires.