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I manifest this Power the other day, and realized it was very ambiguous. Here is the relevant text (from the Xenos 2, Genestealer Cult List):

If the score "...is equal to or greater, that model can immediately shoot another enemy unit of your choice, or make a single close combat attack against it, as if it were part of your army."

So similar to the Inquisitor power, Dominate, except that one specifies that "you can force the model to immediately shoot a single weapon or make a single close combat attack..."

So if I mind control an Eldar wraithlord, equipped with two flamers and a starcannon, can I:

a) Shoot all three weapons;
b) Shoot all of the shots from only one weapon; or
c) Shoot only 1 shot from one weapon

If the Wraithlord is within 6" of an Eldar Autarch, can I choose to re-roll any 1s to hit? If not, is it because the Wraithlord is part of "my army," or because the Eldar player controls the decision whether to re-roll?

You'd get to shoot all weapons as the rule text doesn't limit it.

And no, you wouldn't get a buff from nearby Characters etc

The reason you don't get aura buffs is because all aura buffs specify "friendly", and the moment you take control it is no longer considered friendly. If it were you would only be able to shoot it at your units, and not his.

Since you cannot make attacks against friendly units.