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OP - You can mix anything with anything, there is no rule against this is the latest codex edition. The only limitations you have are the ones in the force organization chart. I also think you could find fluff rules for mixing tzeentch units with khorne units. The biggest fluff option being the black legion. Abaddon has brought together all types of units from all 4 god worshipping chaos chapters. He has berzerkers fighting beside plague marines and noise marines fighting alongside tzeentch marines (although possibly not 1ksons/rubric marines).
Zid wrote:its just fluff.... tho honestly, it doesn't make much sense, but all demon players do it anyway (seeing as Tzeench stuffs the only shooty crap in our army!)
Everyone pairs tzeentch with khorne? I don't think I've seen an army list in quite a while that does this. I see more solid khorne or solid nurgle lists (often with a slaanesh prince/sorc for lash) than tzeentch at all really.
I also don't understand why you think tzeentch is the only shooty option in our army? You could make an argument that they are our best anti-
meq troop option, but the only shooty option? I would say out of the main troop types slaanesh's noise marines are the far more shooty option (albeit more focused on anti-infantry than say anti-mech shooty).