Astartes Rivalries and Hatreds?
*There may be spoilers throughout this post depending on your having read certain Horus Heresy books or not.
I'm just curious as to what other Astartes Legion or particular xeno race each of the 18 Legions has a rivalry or hatred of and why. This can also include 'friendly' rivalries and 40k Chapters.
Also if anyone wants to list their custom Chapter or Chaos Warbands particular rivalry/hatred that might be alot of fun too, and will add a bit more longevity to the topic.
I'll get the ball rolling :
Ultramarines - Word Bearers would be a definate due to the battle of Calith during the Heresy. Tyranids as well due to the battle of Maccrage againt Hive Fleet Behemoth.
White Scars - The Dark Eldar would definately be high on the White Scar's hitlist due to the raids on their home planet during the Heresy and the fact their Primarch was either slane or has been captured by DE forces in the webway.
Blood Angels - I would imagine Abaddon would personally be on their (s)hitlist due to simply having the Talon of Horus and also in a recent novel Fabius Bile caused quite a few problems for them.
Imperial Fists - This would be the Iron Warriors as they had a rivalry even before the Heresy started as Perturabo hated Dorn's guts, and this culminated in the Iron Cage 'incident' lol.
Space Wolves - Thousand Sons would be their biggest rivalry I would think. I haven't read Prospero Burns yet, just Thousand Sons, so I'm biased in believing this is all there fault. So please if you want to elaborate more use spoiler tags lol.
Dark Angels - I would say themselves due to the whole hunting of the Fallen.
Iron Hands - Definately the Emperor's Children as their Primarch was slain by Fulgrim personally.
Crimson Fists - I would imagine they have an intense hatred for the Orks.
Black Legion - I would say literally everyone. They hate the Imperium in it's entirety and also they were turned on by all the other Chaos Legions in the Eye of Terror for being the first ones to retreat on Terra. Although the Emperor's Children and Fabius Bile might be particularly disliked for trying to clone Horus.
Word Bearers - You only have to read The First Heretic to find out why they would hate the Ultramarines so much. Also apparently they dislike the Alpha Legion due to the nature of each Legions tactics and how they often come into conflict. So when the WB's try to set up Chaos cults the Alpha Legion may be trying to set-up terrorist like cells etc. Interestingly they also have kept up their hatred of all xeno's as well, which is indicated in The Word Bearer's Trilogy.
Thousand Sons - I would imagine that the Space Wolves aren't going to be invited to the Sorcerer's planet anytime soon (although maybe they will, but it won't be to their liking). The novel Thousand Sons made me completely sympathise with this Legion's plight.
Iron Warriors - They are pretty bitter about everyone, but the Imperial Fists and all of their Chapters would no doubt be the recipients of most of their hate. Although boy did they get them back in style (Ironcage).
World Eaters - Easy answer would be everyone or Emperor's Children (because of GW's new simplified understanding of Chaos rivalries) although I would guess Kharn wouldn't be looked upon very kindly.
So there you have it folks. That's my contribution so far.
Just to reiterate, if anyone else want to contribute their own Chapter/Legion/Warband's fluff as well as talking about the original Legions, that might be a more fun way of discussing this topic.