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So one thing has got me hung up with army building, if I build different detachments with different legions, say a battalion with deathguard and a fast attack with world eaters, do I get access to all of their stratagems and spells?

 UncleJetMints wrote:
So one thing has got me hung up with army building, if I build different detachments with different legions, say a battalion with deathguard and a fast attack with world eaters, do I get access to all of their stratagems and spells?

Yes, you do, so long as each detachment meets the rules for being a "pure" detachment of that kind.

You can even use the stratagems from one detachment on a unit of the other if the unit meets the criteria.

Spells depend on the datasheet of the psyker, nothing to do with detachments.