Why do Space Marines hate Xenos?

Because they agreed in the need for xenocide. At the time of the Heresy, the issue was simply that Horus and the Traitor Legions felt that the Legions should be in charge of the Imperium, as they had fought and bled for it, rather than the Emperor that had abandoned them to rule from Terra.

Are Primaris immune to chaos?

Primaris aren’t ‘immune’ from chaos. Certainly grey knights and Custodes are likely more resistant to the temptations of dark powers. Certainly grey knights and Custodes are likely more resistant to the temptations of dark powers.

What is Xenos Warhammer?

Xenos (pronounced ZEE-nahs or zehn-AHS) is a High Gothic term used by the people and adepta of the Imperium of Man that means “stranger” and “alien.” It is often used by the Adeptus Terra to signify enemy aliens or off-world, non-Human forces.

Why is the imperium xenophobic?

The Imperium is so xenophobic because most xenos are even worse than they are, and even “nice” xenos are usually only pretending. Even when they encounter genuinely good xenos, the crap they’ve been through means they’d rather kill them than risk billions of their own lives.

Does the Imperium ever work with Xenos?

Yep. Its based on a religious doctrine of racial superiority, evolved from the original desire of the Emperor for humanity to rule the stars. They actually employ a few Jokaero (Space Orang Utans who are good with tech-stuff) who are Xenos if I don’t get that wrong.

What are all the races in Warhammer 40K?

Warhammer 40K: Every Race Ranked From Weakest To Most Powerful

10 Dark Eldar.
9 Tau.
8 Astra Militarum.
7 Space Marines.
6 Inquisition.
5 Necrons.
4 Forces of Chaos.
3 Eldar.

Who are the most powerful space marines?

The Dark Angels are considered among the most powerful and secretive of the Loyalist Space Marine Chapters and were the first of the original 20 Space Marine Legions to be created during the First Founding.