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Had a strange occurrence in a game today, don't know if was legal, we considered it to be a head scratcher.

A Necron DoomSythe was targeted by Dominate. It then failed it leadership test when trying to move, someone at the Shop said vehicles are all LD10, I remember this as well for older editions. So it could not move so it crashed.

Correct?

I've seen nothing to say vehicles have LD at all, unless they specifically say so (GK vehicles casting, BA libby dread).

BRB FAQ
Page 76 – Vehicles, Leadership and Morale.
Change the section in bold to “Therefore, vehicles never take
Morale checks or Leadership tests for any reason”.

And while it's in the Assault section of the vehicle rules with a FAQ addition it seems quite like a blanket statement. Vehicles don't normally take LD tests, so I don't see how the power could work on them.

edit: and further on in the FAQ... why are these documents such a mess?

Q: Can psychic powers or other effects that cause a Leadership test,
for example the Tyranids’ Psychic Scream, affect vehicles or units
embarked upon transports? (p76 / p78)
A: No.

Ty we didn't think to check the FAQ, so would hallucinate work against a vehicle, no leadership test, just an effect.

It does work, though the Hallucination is pretty obviously is written on the assumption that it is only used against infrantry or MC's, not vehicles.

Though there is pretty large chance it will do nothing: "Bugs! I hate Bugs! does nothing for vehicles and "You! You're a Traitor!" only works for Walkers.

So RAW yes, RAI no on hallucination.

Dominate and Terrify don't work on vehicles as Spetulhu said.

Puppet master works reliably only on vehicle squadrons, because focussed witchfire rules state that "If the total is greater than 5 and the Psychic
test is passed randomly select a different model in the same unit for the power to be resolved against" . So against single vehicles you need to roll 5 or less for it to work.