The Dimensional Shambler is a race of monsters from a different dimension that first appeared in H.P. Lovecraft's story The Horror at the Museum and later fully described in Clark Ashton Smith's story The Hunters from Beyond.
These "hunters from beyond" appear as short crouching creatures with tight grey mummy like skin. Its head is semi ape like and semi canine, and has crooked stained fangs. Its eyes are recessed in deep eye holes and appear as yellow slits. It has long arms with huge claws. Though it has the appearance of being material the Dimensional Shamblers origin in a different dimension makes it immaterial in our world, making it unable to touch or be touched.
The Shamblers come from a lower dimension described as "a long, gray, oozing plain, beneath skies where the fumes of Hell were writhing like a million ghostly and distorted dragons." In this dimension thousands if not more Dimensional Shamblers live. Humans sucked into this dimension sink into the gray ooze to have their minds and souls eaten by the Shamblers.
The Shamblers can be called to our dimension with certain spells or pure will power, the Shamblers being keen on hunting victims. When they have chosen a victim they will attempt to suck them into their own dimension calling as many of their cohorts as needed. While they do seem to grab at the victim they actually use a form of hypnosis that can be broken by a strong willed person. Its possible that a larger amount of the Shamblers can be more powerful. When they try to suck a victim in it will seem as if the place around the Shambler disappears behind it and their own dimension will become visible.
The Shamblers can also move and appear at will in our own dimension without apparent effort. When moving around they will seem to jump between places.