Legions Imperialis – Adding a Legio, Knight House or Auxilia to your Loyalist Legion

In Legion Imperialis you have the opportunity to use combined forces, so not just Astartes but field them with support of Knight Households, Titan Legios and Imperial Militias or Auxilia regiments. But which Legiones Astartes fought alongside which of those and what would create a proper alliance according to the lore?

Of course, you can do what you want, it is your hobby, but with the Horus Heresy community known for being fluff bunnies, this is something I wanted to share with you, based upon lists from the fan wikis and combined work by people like David from Cat Hair in the Paint Pot.

I merged the lists and linked the according information from the wikis, so you have it at hand by looking up your Legiones Astartes. Beginning with the Loyalists. With the exception of the Raven Guard, every loyalist legion fought at one point along side the Legio Gryphonicus (War Griffons) and each of them can use the Solar Auxilia without any doubt.

The 1st Legion, the Dark Angels from Caliban, already have the opportunity to bring their troops in Black, Green or White, but are able to field an even broader variety with the following affiliated factions.