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I've never really used allies in Horus Heresy before, so when I was creating my list, I couldn't really find an answer for my question, which is:

Can I, as a Mechanicum player, ally with myself? As in a primary Mechanicum detachment using the regular Age of Darkness FoC, and then an allied Mechanicum detachment as well. I can't really find anything other than "check the allied chart", but there I find no concrete answer.

If I remember correctly, then in 7th edition 40k it was specifically stated that the allied detachment could not be the same faction as the primary detachment, but in my Mechanicum Taghmata book, which contains all the basic rules and force organisation charts as well, I can't find that stated anywhere.

What I want to do is have a Reductor or Taghmata primary detachment (not using the Reductors own detachment, since then you can't have allies at all) with a Cybernetica allied detachment. Would this be possible?


Automatically Appended Next Post:
I found the latest FAQ from Forgeworld, and it specifies that an allied detachment cannot be the same Legion as the primary, but nothing on Mechanicum.

It's looking like a 'No'.

The Ordo Reductor and Legio Cybernetica are 'sub-types' of the Taghmata Omnissiah list (mechanicum red book, page 14, paragraph 4)
The allies chart on page 185 of book 5 has a note stating..

Note: The Mechanicum line of the table is used for an army selected from the Ordo Reductor, Legio Cybernetica, Taghmata Omnissiah and Questoris Knight Crusade army lists. The Solar Auxillia Crusade Army list uses the Imperial Army line.

Combine that with the diagonal gap through the chart which effectively stops you allying a faction with itself and you technically can't ally mechanicum with itself OR a knight household.

Technically speaking, by that chart you can't ally a cult/militia list with anything...

Personally, I consider the Taghmata, Legio Cybernetica and Ordo Reductor, Questoris Knight Households, warp-cults and imperial militias to each be a separate codex as well as each different Legion.

Hmm, Yeah, might be a no. I will just talk it out with my opponent, see if he agrees. It's not very clearl, could be either way.

 SirDonlad wrote:

Technically speaking, by that chart you can't ally a cult/militia list with anything...

Mind you, Militia book tells you to use Imperial Army line for the allies table in the same box they speak about the changes to the table caused by provenances.

Regarding Mechanicum allying Mechanicum, I'd say that it's possible if you use different Mechanicum lists because that makes sense to me because why wouldn't two different units of Mechanicum work together?

I played a game with these two detachments, and I came to the conclusion that using both is very much overkill.

Mechanicum is very strong using either lists, but with the benefits of both, my opponent couldn't really do anything.

Also, I think it's more fun to actually specialize your force, and give it a theme. Since Legions cannot ally with themselves, I will from now on do the same for Mechanicum. We are good enough as is, we don't need both at the same time

You can include an effervescence of Ordo Reductor in a Taghmata Omnissiah list by having Calleb Decima as a non-compulsory HQ - him and a unit he joins gain the 'walkers in ruin' rule (ignoring terrain effects and penalties in ruins, rubble, trenchworks, etc..)