I've been using the animation system recently and come across a couple of bugs.
Using items seems to work fine with summoning multiple undead but when you rest you lose any undead that were summoned using a corpse (Not shambling corpses).
Also when you animate a corpse it doesnt seem to register with any summoning points (At least with Wild Orc corpses).
* All corpses that you animate don't register summoning points from items
Scrap that when you try to summon multiple corpses with items it simply unsummons the last one which is very frustrating when you've spent lots of gold on aquiring useful corpses.