The Big Dark Templar Citadel Thingies... Hypothesis

I still don't buy that this is just a req. building for Dark Templars, unless they changed its role since the screens, which I suppose is pretty possible. They're all over the cliffs and chokes, I think they boost shield regeneration or the power of the shields of the units nearby.

 

^Great... an aura... even more WC reference... *grumble grumble*^

Seriously tho, I think it could be a sort of a support building, adding shields and stuff. That would be pretty cool, especially when defending chokes.

 

maybe the guy built his base poorly, and maybe theres a bunch of research at them so you need a buch of them to get it all. supply depots and barracks are commonly seen at chokes, and they dont have any auras. we will just have to wait and see.