Slammer.

These abhorrent creatures, refered to as "Slammers" due to their tendendies to drop down on unsuspecting foes to crush them, have made themselves at home inside the Greyout zones. Autopsies have proven that the Slammers themselves are spindly osseous creatures lacking any oriphices or organs, that somehow scavenge tissue and sinew from victims. Why and how they dress themselves in flesh is not understood, but the genetic composition of tissue most abundantly assimilated by Slammers clearly signify that they are an enemy of Dwarfs. Exterminate on sight.