Hook horror

A hook horror is a large bipedal subterranean aberration that looks like a vulture-like humanoid with bony hooks in place of hands.

Appearance
A hook horror stands about nine feet (2.7m) tall and weighs almost 350 pounds (160kg). It has a mottled grey exoskeleton which is extremely thick and dense, as difficult to breach as metal armor. Instead of hands, paws or claws, its front limbs end in 12 inch (30cm) razor-sharp, blade-like hooks. These hooks are the hook horror's primary method of combat. Its legs are similar to those of a bird, and its head is shaped like that of a vulture, including the hooked beak. Its eyes are multifaceted like that of an insect.

Origins
It is thought that the hook horror is distantly related to the cockroach, despite its bird-like qualities.

Ecology
Hook horrors have their own language, communicating in a series of clicks and clacks. In a cave, this eerie sound can echo a long way and can be used to estimate cavern sizes and distances, much like the sonar of a bat.