U02dah4 wrote:One of the elucidians has the keywords adeptus mechanicus and mars but not the faction keywords another has adeptus ministorum written in the same way.
I am assuming this means that they can't be taken in say a mars detatchment but a mars aoe buff or strategem could effect them?
Correct. From the Designers Commentary:
Q: What is the difference between a keyword and a Faction keyword?
A: The only real difference is that Faction keywords are used when building an army; when Battle-forging an army, for instance, you will often only be able to include units in the same detachment if they share the same Faction keyword. Also, if you are
playing a matched play game, you will need to have an Army Faction – this is a Faction keyword that is shared by all of the units in your entire army (with the exception of those that are Unaligned). Once the battle has begun, there is no functional difference between a keyword and a Faction keyword.
Of course
GW contradict themselves with other Special Snowflake
FAQs regarding Tyranid and Chaos Daemons stratagems, but make of that as you will.