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(I'm sure this has probably been asked already, but anyway)

Maybe I'm just being finnicky, but it does say that, for an army to be Bound, everything in it must be of the same faction, or factionless, unless stated otherwise.
Tech priest is Cult, not Skitarii like the Dunecrawler and Rangers/Vanguard.

I can't find anything that states that formation can actually be Bound.

Formations are unique Detachments.
A Detachment is bound if it meets the criteria.
As long as you meet the Formation requirements, you're Bound.

 Kanluwen wrote:
Formations are unique Detachments.
A Detachment is bound if it meets the criteria.
As long as you meet the Formation requirements, you're Bound.

Ohhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh

No idea how I missed that, looking back at the big black red-bordered box in the rulebook...
Thankyou very much.