Hordlings
From Multiversal Omnipedia
Hordlings are a type of fiend native to the Gray Waste. Hordlings roam the plane in massive numbers, and each has a uniquely twisted and horrific shape. The fiends can be summoned to the Prime Material Plane- often with fatal results- using a device known as the Bringer of Doom.
Comments
The hordlings were originally developed from a random extraplanar monster generator in the original Dungeon Master's Guide.