Will the AI use Greater Powers? I want to give a Flame Atronach a powerful Fire Shield spell that I can guarantee to be only one use, without having to play around with magicka and spell cost, and risk ending up with a creature that has much more magicka than I intended (and not use the special spell). I don't recall ever seeing an NPC use a racial ability, so I'm not terribly confident.
Also, Wraithguard has a Shield effect, but when the player equips it, the shield animation always goes away; on other items with Shield, it stays. Why does this happen? It's actually desirable; I'd prefer for my Flame Atronachs to not be encased in that swirling Fire Shield animation, if at all possible.
Edited for clarity.