Thrashers 

Mollusc-like scavengers that dwell in junkheaps in search of organic material and weaponry. They are said to fear the sun and so are often clad in rags and/or garbage, with only their sword-like claws and silhouette being visible. Though they are content with the leavings of a broken civilization, they are drawn toward movement and will pounce ravenously upon any human they encounter.

While an uncommon circumstance, some Thrashers will squeeze their way into houses or bunkers to feed on everyone inside. Communities will often patrol the surrounding areas and underground sewer systems to prevent such infestations. Certain wards or magna-field defenses can also prevent this from occurring.

There are other varieties, some with more intelligence or with greater bulk than the ordinary Thrasher. 

They are said to be relatives to the greatly feared Flensers, horrific creatures that wear animal or human skins instead of rags or trash and display sorcerous abilities and malicious intellect.