7th Ed. acouple rules questions

when i posted my army list this actually raised some rules questions I have.
When I mentioned fighting undead a bunch of people replied that I should use plaque of dominion to stop the casters.

undead units however are immune to psychology, this was further made confusing by the fact that there is an items that gives an undead character a 4+ ward save in exchange for having to take stupidity tests (crown of the damned)

so then does plaque of dominion actually effect vampires and necromancers or what?


also with engine of the gods it says that you have to choose which power at the beginning of the magic phase but does that mean you have to use it at the beginning or do you just choose which you can use during the magic phase? (just curious if it can be effected by the d3 heavens spell)

 

Stupidity is not negated by immune to psychology, take the plaque, it works against anything that is a wizard, and over the course of the game he'll fail something, hopefully.

Besides, remember when you could make a cold one rider ITP? Didn't work for us, doesn't work for them.

 

If you were to use Burning Ailment as your Engine's spell, it would go first.