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The last game I play was the first time I played using 2 attachments (Primary and an allied detachment). My opponent did the same.

When we were rolling form traits, he rolled twice. When I asked him about it, he told me that warlords were per detachment.

Is this true? I always assumed you could only have 1 warlord.

So, Dakka, how do Warlords work?

"When choosing your army, you must nominate one model to be your Warlord"

So that's one model per army, not one model per detachment.

There is technically no RAW for this far as i know, even in the FAQ. All it says is the highest leadership in your army is the warlord unless theyre competing for that then you pick which one.
I would imagine since your allies are still part of your army it would count as 1 warlord overall. If it were allies with multiple players (2v2 or so) then it would be multiple warlords, technically.

You only get one warlord. So only one warlord trait.

Just to add, the rules clarify that
a) your Warlord must be from the Primary Detachment, and
b) if you are using double FOCs, there is still one Warlord.

 Vineheart01 wrote:
There is technically no RAW for this far as i know, even in the FAQ.

Page 109 of the Warhammer 40K 6th edition rulebook; first paragraph, last sentence under the heading 'Primary Detachments'.