So I just noticed that each legion counts as a chaos space marine faction, for the purposes of allies. So doesn't that mean I can run my Black Legion detachment with Iron warrriors and mix all their legon special rules with mine ( not detachment rules obv) if I switch and swap my HQ Choices (especially mixing wargear combinations). That alpha legion (Chaos Undivided artifact) is looking even more dumb if I can put an alpha legion lord with my Black legion terminators or on Iron warrios Oblits to detach from combat and shoot people.
Is this really OP? Anyone figured out some crazy combos yet?
After Skimming for 5 mins I think I found 1 dumb example of what I mean. Mixing World Eaters Bezerksers on Foot with Night lords Chaos Lord Confers the unit Stealth and a wargear Item gives +1 to stealth. Im not sure if I have understood the rules correctly but since those rules are confered to models and not detachments it seems to me they should transpher to other battle brothers of the same faction when the Lords Join the unit?