Void demons

Void demons, as their name suggests, are creatures that spawn in the realm known as the Void.   They are believed to be manifestations of Turoch's's wrath or manifestations of his endless hunger or both.   Generally, you can gage the power of a Void demon by it's size. With very few exceptions, larger demons are smarter and more foreword thinking than smaller demons, larger demons have stronger psionic and magic powers than smaller demons, and smaller demons usually obey larger demons unquestioning. All demons regardless of power level, seem to be relentlessly searching for passage into the material plane. Once there they will make every effort to seek out mortal souls to consume. If circumstances prevent them from finding mortal souls and they are not restrained by a superior, most demons will eventually start killing animals though draining the life force of animals seems to be mostly empty calories for them.   Temporary holes open and close in the Barrier often. Most Void demons presumably spend most of their time probing the Barrier for weaknesses. Big small holes are more common than large holes, most of the demons that escape into the material plane during the the Third Age are relatively small and weak demons. Gaps in the Barrier often close without warning.  If they close on a demon while crossing they could be sliced in half and destroyed or if they are lucky, they might merely lose a limb or a tail.   Demon grunts are a relatively common sight, Death demons seem to represent the ceiling, no larger or stronger seem to have crossed over since the Barrier was repaired after the damage it took during the Second Unmaking.