My understanding of the rules is that all units in a given detachment need to share a common "Faction Keyword". This might be "Astra Militarum", "Adeptus Mechanicus", "Adeptus Custodes", or "Inquisition" as a few examples. These keywords, combined with the way unit entries are organized in the Imperium 2 book make it seem like all units in a detachment must share this keyword, HOWEVER, I have also noticed that every unit in the book has the "IMPERIUM" keyword. Does this mean that I could legally create a Brigade Detachment with every single unit belonging to a different Imperial "sub-faction" than the next, so long as every unit shares the "Imperium" keyword? RAW seems to support this, but I haven't seen any talk about this. If this is not permissible, things like Inquisitors and assassins won't legally fit into Imperial armies that do not share their "sub-faction" keywords. What are your thoughts? Is this detachment legal? Is it battle-forged?
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